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A151676 Let c(n) = x^(2^n-1)*(1-x^(2^n)), g(n) = 1+x^(2^n-1)+x^(2^n), h(n) = Prod_{i=1..n} g(i); then use g.f. Sum_{ n >= 1 } c(n)/h(n). 1
0, 1, -1, 0, 1, -1, -1, 1, 0, 0, 2, -1, -2, 0, -2, 1, 5, 1, -1, -3, -7, -1, 8, 8, 6, -3, -18, -16, 0, 17, 31, 21, -19, -51, -47, -3, 70, 106, 48, -71, -170, -156, 18, 243, 318, 132, -253, -564, -455, 130, 819, 1024, 341, -952, -1849, -1355, 606, 2789, 3199, 727, -3410, -5979, -3932, 2678, 9408, 9926, 1281, -12047 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,11

LINKS

Table of n, a(n) for n=0..67.

CROSSREFS

Cf. A151684.

Sequence in context: A058666 A112181 * A151684 A118207 A055378 A217921

Adjacent sequences:  A151673 A151674 A151675 * A151677 A151678 A151679

KEYWORD

sign

AUTHOR

N. J. A. Sloane, May 31 2009

STATUS

approved

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)