A151676 Let c(n) = x^(2^n-1)*(1-x^(2^n)), g(n) = 1 + x^(2^n-1) + x^(2^n), h(n) = Product_{i=1..n} g(i); then use g.f. Sum_{n>=1} c(n)/h(n).

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

Offset

0,11

Links

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

Crossrefs

Cf. A151684.

Sequence in context: A077883 A058666 A112181 * A151684 A118207 A327274

Adjacent sequences: A151673 A151674 A151675 * A151677 A151678 A151679

Keyword

sign

Author

N. J. A. Sloane, May 31 2009

Status

approved