A047135 a(n) = T(n,n-3), array T as in A047130.

1, 4, 14, 48, 151, 496, 1679, 4892, 16099, 55566, 126070, 437604, 1610354, 10586223, 37753710, 142615460, 545804530, 2501659594, 9822392246, 38387432220, 149904480000, 622664257407, 2483093527816, 9821396841402

Offset: 3

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A047130.

Extensions

Definition corrected by Georg Fischer, Jan 20 2020