A377074 E.g.f. satisfies A(x) = exp( 3 * (exp(x*A(x)^(1/3)) - 1) ).
1, 3, 18, 165, 2061, 32811, 637257, 14642193, 389057430, 11747586063, 397565941269, 14912009309445, 614213244344793, 27567329246005971, 1339377910615420638, 70046231354507450073, 3923758699955830877073, 234413127343266493562103, 14878805575508681816632017
Offset: 0
Keywords
Programs
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PARI
a(n) = 3*sum(k=0, n, (n+3)^(k-1)*stirling(n, k, 2));
Formula
a(n) = 3 * Sum_{k=0..n} (n+3)^(k-1) * Stirling2(n,k).