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Search: id:A166520
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A166520 a(n)=5*n-a(n-1), (with a(1)=1) +0
1
1, 9, 6, 14, 11, 19, 16, 24, 21, 29, 26, 34, 31, 39, 36, 44, 41, 49, 46, 54, 51, 59, 56, 64, 61, 69, 66, 74, 71, 79, 76, 84, 81, 89, 86, 94, 91, 99, 96, 104, 101, 109, 106, 114, 111, 119, 116, 124, 121, 129, 126, 134, 131, 139, 136, 144, 141, 149, 146, 154, 151, 159 (list; graph; listen)
OFFSET

1,2

FORMULA

a(n)=(5/4)+(11/4)*(-1)^n+(5/2)*n, with a(1)=1 [From Paolo P. Lava (ppl(AT)spl.at), Nov 10 2009]

EXAMPLE

For n=2, a(2)*5*2-1=9; n=3, a(3)=5*3-9=6; n=4, a(4)=20-6=14

CROSSREFS

Sequence in context: A137907 A070164 A063602 this_sequence A102648 A040074 A088999

Adjacent sequences: A166517 A166518 A166519 this_sequence A166521 A166522 A166523

KEYWORD

nonn,new

AUTHOR

Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 16 2009

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Last modified November 22 20:51 EST 2009. Contains 167312 sequences.


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