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A191492

Central coefficients of triangle A191490.

1, 2, 18, 325, 9050, 342004, 16332659, 942562092, 63762184160, 4945947976997, 432648272729266, 42126940392610000, 4518312124929961241, 529235540464230162094, 67213443963719684144890, 9199173104526838608066833

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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 A392717 A123311

Adjacent sequences: A191489 A191490 A191491 * A191493 A191494 A191495

KEYWORD

nonn

AUTHOR

Emanuele Munarini, Jun 03 2011

STATUS

approved

URL: https://oeis.org/A191492

⇱ A191492 - OEIS