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A110577

{a(1,n)}, where a(m,n) is defined in sequence A110576.

1, 2, 4, 11, 40, 172, 820, 4227, 23336, 137282, 857178, 5659496, 39372213, 287657495, 2200586044, 17579891124, 146309132849, 1265828289411, 11362930635404

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OFFSET

0,2

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..570

MATHEMATICA

a[0, 0] := 1; a[0, 1] := 1; a[0, n_] := a[0, n] = Sum[Binomial[2*n - k - 3, n - 2]*a[0, k], {k, 0, n - 1}]; a[1, 0] := 1; a[1, n_] := a[1, n] = a[1, n - 1] + a[0, n]; Table[a[1, n], {n, 0, 50}] (* G. C. Greubel, Aug 31 2017 *)

CROSSREFS

Cf. A110576, A110578, A110579, A110580.

Sequence in context: A173938 A242790 A013044 * A335441 A012948 A013182

Adjacent sequences: A110574 A110575 A110576 * A110578 A110579 A110580

KEYWORD

easy,nonn

AUTHOR

Leroy Quet, Jul 28 2005

EXTENSIONS

More terms from Ryan Propper, Sep 25 2005

STATUS

approved

URL: https://oeis.org/A110577

⇱ A110577 - OEIS