A292161 Main diagonal of A292159.

1, -1, -4, -18, -32, -75, 1188, 2205, 7936, 19278, 49500, 87120, 185760, 312988, 574868, -10481175, -15271936, -46022672, -98470404, -230150496, -440484000, -932930208, -1572331596, -2940575576, -4940815104, -8508211250, -13542949524, -22406625648

Offset: 0

Author

Seiichi Manyama, Sep 10 2017

Keywords

• sign

Crossrefs

Cf. A292159, A292162.

Formula

a(n) + i*A292162(n) = [x^n] Product_{k>=0} (1 - n*i*x^k), where i is sqrt(-1).