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Search: id:A052109
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| A052109 |
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a(1)=1, a(n)=a(n-a(1))+a(n-a(2))+a(n-a(3))+....a(n-a(n-1)) for n>1, with convention that a(i)=0 for i<=0. |
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+0
2
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| 1, 1, 2, 5, 12, 30, 73, 178, 434, 1058, 2580, 6291, 15341, 37408, 91217, 222427, 542374, 1322546, 3224947, 7863835, 19175478, 46758223, 114017050, 278023561, 677943348, 1653123143, 4031039074, 9829440768, 23968486545, 58445679752, 142516194140, 347516970942
(list; graph; listen)
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OFFSET
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1,3
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REFERENCES
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Emmanuel Preissmann, A Self-Indexed Sequence, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.5.
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EXAMPLE
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a(5)=a(4)+a(4)+a(3)=5+5+2=12.
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CROSSREFS
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Sequence in context: A101411 A042789 A101911 this_sequence A157748 A046170 A062423
Adjacent sequences: A052106 A052107 A052108 this_sequence A052110 A052111 A052112
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KEYWORD
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easy,nonn,nice
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AUTHOR
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Robert Lozyniak (11(AT)onna.com), Jan 20 2000
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EXTENSIONS
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More terms from David W. Wilson (davidwwilson(AT)comcast.net), Feb 01 2000.
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