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A156248 a(n)=sum(k=1,n,(-1)^k*A000002(2*k)) 0
-2, -1, -3, -1, -2, 0, -1, 0, -2, -1, -2, 0, -2, -1, -3, -2, -3, -1, -3, -2, -4, -2, -3, -2, -4, -3, -5, -3, -4, -2, -4, -3, -5, -4, -5, -3, -5, -4, -5, -3, -4, -2, -3, -2, -4, -2, -3, -1, -2, 0, -2, -1, -2, 0, -2, -1, -3, -2, -3, -1, -2, -1, -3, -2, -3, -1, -2, 0, -2, -1, -3 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..71.

CROSSREFS

Sequence in context: A129761 A319299 A207031 * A324817 A106406 A123864

Adjacent sequences:  A156245 A156246 A156247 * A156249 A156250 A156251

KEYWORD

sign

AUTHOR

Benoit Cloitre, Feb 07 2009

STATUS

approved

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Last modified October 15 18:40 EDT 2021. Contains 348033 sequences. (Running on oeis4.)