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Search: id:A139802
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| A139802 |
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a(1)=1, a(2)=2, a(n)=n^a(n-2) |
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+0
2
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| 1, 2, 3, 16, 125, 2821109907456, 43376549480979932825373547572631882516978329946204051017448930177445694327209941\ 68089672192211758909320807
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Exponential double factorial.
The next term is too large to include.
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EXAMPLE
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a(1)=1
a(2)=2
a(3)=3^1=3
a(4)=4^2=16
a(5)=5^3=125
a(6)=6^16=2821109907456
etc.
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MAPLE
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P:=proc(n) local a, b, c, i; a:=1; b:=2; print(a); print(b); for i from 3 by 1 to n do c:=i^a; print(c); a:=b; b:=c; od; end: P(10);
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CROSSREFS
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Cf. A049384.
Sequence in context: A007118 A012572 A067848 this_sequence A063666 A006247 A052318
Adjacent sequences: A139799 A139800 A139801 this_sequence A139803 A139804 A139805
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KEYWORD
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easy,nonn
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AUTHOR
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Paolo P. Lava & Giorgio Balzarotti (ppl(AT)spl.at), May 22 2008
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