A097198 G.f.: q^(2*n)* Product_{m=0..n-1} (1-q^(2*m+1))^2.

1, 0, 1, -2, 2, -2, 2, -4, 6, -6, 7, -10, 12, -12, 16, -22, 25, -28, 34, -42, 50, -56, 64, -80, 94, -104, 122, -146, 168, -190, 218, -256, 295, -330, 378, -440, 500, -560, 638, -734, 830, -930, 1053, -1198, 1352, -1510, 1696, -1924, 2160, -2404, 2696, -3034, 3390, -3770, 4208, -4712, 5252, -5824

Offset

0,4

Comments

Inspired by A000700.

Links

Table of n, a(n) for n=0..57.

Crossrefs

Sequence in context: A064877 A008363 A261611 * A126663 A032600 A103260

Adjacent sequences: A097195 A097196 A097197 * A097199 A097200 A097201

Keyword

sign

Author

N. J. A. Sloane, Sep 17 2004

Status

approved