0,2

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

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]; a[2, 0] := 1; a[2, n_] := a[2, n] = a[2, n - 1] + a[1, n]; Table[a[2, n], {n, 0, 50}] (* G. C. Greubel, Sep 01 2017 *)

Cf. A110576, A110577, A110579, A110580.

Sequence in context: A062416 A366578 A259885 * A134045 A079898 A173449

Adjacent sequences: A110575 A110576 A110577 * A110579 A110580 A110581

easy,nonn

Leroy Quet, Jul 28 2005

More terms from Ryan Propper, Sep 25 2005

approved