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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; internal format)
OFFSET

1,1

CROSSREFS

Sequence in context: A191861 A129761 A207031 * A123864 A035175 A106406

Adjacent sequences:  A156245 A156246 A156247 * A156249 A156250 A156251

KEYWORD

sign

AUTHOR

Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 07 2009

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Last modified February 17 10:57 EST 2012. Contains 206009 sequences.