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 A336172 a(n) = Sum_{k=0..n} (-1)^(n-k) * multinomial(n+(n-1)*k; n-k, {k}^n). 2
 1, 0, 1, 1109, 58370761, 616967236620839, 2667424979594724623421841, 7363013376580445620328429354795257679, 18165626590057176919253932602358956717053291818375681, 53130672834302729155813211757017136527240145191602729876485547920535679 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 LINKS Seiichi Manyama, Table of n, a(n) for n = 0..26 FORMULA a(n) = [x^n] Sum_{k=0..n} (n*k)!/k!^n * x^k / (1+x)^(n*k+1). MATHEMATICA a[n_] := Sum[(-1)^(n - k)*(n + (n - 1)*k)!/((n - k)!*k!^n), {k, 0, n}]; Array[a, 10, 0] (* Amiram Eldar, Jul 10 2020 *) PROG (PARI) {a(n) = sum(k=0, n, (-1)^(n-k)*(n+(n-1)*k)!/((n-k)!*k!^n))} CROSSREFS Main diagonal of A336169. Cf. A229267. Sequence in context: A172774 A234156 A066163 * A252010 A036105 A036103 Adjacent sequences:  A336169 A336170 A336171 * A336173 A336174 A336175 KEYWORD nonn AUTHOR Seiichi Manyama, Jul 10 2020 STATUS approved

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Last modified June 25 03:59 EDT 2022. Contains 354835 sequences. (Running on oeis4.)