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

0,2

Links

Table of n, a(n) for n=0..23.

Crossrefs

Cf. A047130.

Sequence in context: A014325 A047028 A220819 * A363468 A111299 A245824

Adjacent sequences: A047135 A047136 A047137 * A047139 A047140 A047141

Keyword

nonn

Author

Clark Kimberling

Extensions

Definition corrected by Georg Fischer, Jan 20 2020

Status

approved