A047138 a(n) = T(n,n+3), array T as in A047130.

1, 4, 14, 48, 179, 656, 2394, 8744, 32791, 123188, 463211, 1744076, 6632688, 25303978, 96699766, 370030836, 1422210560, 5479757300, 21147107145, 81707846148, 316422360163, 1227500661756, 4768032430608, 18539704936398

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Crossrefs

Cf. A047130.

Extensions

Definition corrected by Georg Fischer, Jan 20 2020