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 A350720 a(n) = Sum_{k=0..n} k! * 3^k * k^n * Stirling1(n,k). 3
 1, 3, 69, 3948, 422082, 72567522, 18304992558, 6367730357160, 2921446409138136, 1709074810258369776, 1241694104839498851552, 1096850187800368469477424, 1157691464039682741551221152, 1438880771284303822650674399664 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..213 FORMULA E.g.f.: Sum_{k>=0} (3 * log(1 + k*x))^k. MATHEMATICA a[0] = 1; a[n_] := Sum[k! * 3^k * k^n * StirlingS1[n, k], {k, 1, n}]; Array[a, 14, 0] (* Amiram Eldar, Feb 03 2022 *) PROG (PARI) a(n) = sum(k=0, n, k!*3^k*k^n*stirling(n, k, 1)); (PARI) my(N=20, x='x+O('x^N)); Vec(serlaplace(sum(k=0, N, (3*log(1+k*x))^k))) CROSSREFS Cf. A320083, A350719. Cf. A195263, A335531, A350721. Sequence in context: A284058 A012096 A012074 * A247031 A037109 A304146 Adjacent sequences:  A350717 A350718 A350719 * A350721 A350722 A350723 KEYWORD nonn AUTHOR Seiichi Manyama, Feb 03 2022 STATUS approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)