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Search: id:A129996
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A129996 a(n) = (-1)^n A000108([n/2]). +0
2
1, -1, -2, 2, 5, -5, -14, 14, 42, -42, -132, 132, 429, -429 (list; graph; listen)
OFFSET

0,3
FORMULA

First differences of A129110.

CROSSREFS

Sequence in context: A056506 A056507 A095014 this_sequence A099363 A106181 A098887

Adjacent sequences: A129993 A129994 A129995 this_sequence A129997 A129998 A129999

KEYWORD

sign

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Jun 15 2007

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

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