A343473 G.f.: 1 + (1*x)/(1 + (2*x)^2/(1 + (3*x)^3/(1 + (4*x)^4/(1 + (5*x)^5/(1 + ...))))).

1, 1, 0, -4, 0, 16, 108, -64, -864, -2660, -22464, 33968, 272268, 1217152, 4629312, 68208188, -98077824, -1089798320, -5246016084, -32436365248, -180561473568, -3404617719332, 5203858765248, 55902314446832, 354805454664396, 2229923884913920

Offset: 0

Author

Seiichi Manyama, Apr 16 2021

Keywords

• sign

Crossrefs

Cf. A343420, A343427.

Programs

PARI

a(n) = my(A=1+O(x)); for(i=1, n, A=1+((n-i+1)*x)^(n-i+1)/A); polcoef(A, n);