A156248 - OEIS

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A156248

a(n)=sum(k=1,n,(-1)^k*A000002(2*k))

-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