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A343928 a(n) = Sum_{k=0..n} (k!)^n * binomial(n,k). 3
1, 2, 7, 244, 337061, 24923091206, 139331988275478727, 82607113404338664216300296, 6984967577834038055008791270166057993, 109110690950275218023122492287310115968068596613130, 395940866518366059877297056617763923418318903997411043997258716171 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Seiichi Manyama, Table of n, a(n) for n = 0..30

FORMULA

a(n) = [x^n] Sum_{k>=0} (k!)^n * x^k/(1 - x)^(k+1).

a(n) = n! * [x^n] exp(x) * Sum_{k>=0} (k!)^(n-1) * x^k.

MATHEMATICA

a[n_] := Sum[(k!)^n * Binomial[n, k], {k, 0, n} ]; Array[a, 11, 0] (* Amiram Eldar, May 04 2021 *)

PROG

(PARI) a(n) = sum(k=0, n, k!^n*binomial(n, k));

CROSSREFS

Cf. A000522, A046662, A072034, A336247, A339311, A343898, A343899, A343929.

Sequence in context: A020459 A343899 A088106 * A294827 A295610 A329967

Adjacent sequences:  A343923 A343926 A343927 * A343929 A343930 A343931

KEYWORD

nonn

AUTHOR

Seiichi Manyama, May 04 2021

STATUS

approved

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Last modified July 30 19:33 EDT 2021. Contains 346359 sequences. (Running on oeis4.)