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A368447 Expansion of e.g.f. exp(-x) / (1 + log(1 - 3*x)). 1

%I #11 Dec 25 2023 10:01:42

%S 1,2,22,305,5767,136526,3883258,128933255,4893787021,208996349714,

%T 9917947451590,517743558041981,29485295251306867,1819129033610512958,

%U 120867373194394631242,8604378456170991789779,653370570548903023444249,52714379598185711313436226

%N Expansion of e.g.f. exp(-x) / (1 + log(1 - 3*x)).

%F a(n) = (-1)^n + Sum_{k=1..n} 3^k * (k-1)! * binomial(n,k) * a(n-k).

%o (PARI) a_vector(n) = my(v=vector(n+1)); for(i=0, n, v[i+1]=(-1)^i+sum(j=1, i, 3^j*(j-1)!*binomial(i, j)*v[i-j+1])); v;

%Y Cf. A330149, A368446.

%K nonn

%O 0,2

%A _Seiichi Manyama_, Dec 24 2023

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