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 A191492 Central coefficients of triangle A191490. 2
 1, 2, 18, 325, 9050, 342004, 16332659, 942562092, 63762184160, 4945947976997, 432648272729266, 42126940392610000, 4518312124929961241, 529235540464230162094, 67213443963719684144890, 9199173104526838608066833 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..45 FORMULA a(n) = A191490(2*n,n). MATHEMATICA f[n_, k_] := f[n, k] = f[n - 1, k] + (n - 1)f[n - 1, k - 1] + If[n == k, 1, 0] f[_, 0] = 1; f[0, _] = 0; Table[f[2n, n], {n, 0, 100}] PROG (Maxima) P[0]:1\$ P[n]:=(1+(n-1)*q)*P[n-1]+q^n\$ makelist(coeff(expand(P[2*n]), q^n), n, 0, 12); CROSSREFS Cf. A191490. Sequence in context: A229490 A192985 A193264 * A090307 A123311 A181536 Adjacent sequences:  A191489 A191490 A191491 * A191493 A191494 A191495 KEYWORD nonn AUTHOR Emanuele Munarini, Jun 03 2011 STATUS approved

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Last modified April 18 04:49 EDT 2021. Contains 343072 sequences. (Running on oeis4.)