A343429 G.f.: 1 + 1^2*x/(1 + 2^2*x/(1 + 3^2*x/(1 + 4^2*x/(1 + 5^2*x/(1 + ...))))).

1, 1, -4, 52, -1252, 47380, -2589892, 193480948, -18967658404, 2364328255444, -365398042310020, 68588722144816564, -15372942045464127076, 4055513943597589455508, -1243968998818298201100868, 439009056263271003371155060, -176627099114433045240563153188, 80365037678138695452520237597012, -41059325231828016124174743746157316

Offset: 0

Author

Seiichi Manyama, Apr 15 2021

Keywords

• sign

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..242

Crossrefs

Cf. A000364, A028296, A343427, A343428.

Programs

PARI

a(n) = my(A=1+O(x)); for(i=1, n, A=1+(n-i+1)^2*x/A); polcoef(A, n);

Formula

G.f.: 1/(Sum_{k>=0} A028296(k) * x^k).