A047039 T(2n,n), array T as in A047030.

1, 1, 4, 22, 126, 751, 4595, 28514, 179277, 1136405, 7256229, 46583010, 300438175, 1944986187, 12632217312, 82269089182, 537071072123, 3513452296105, 23026993173298, 151165338147804, 993811676366531, 6542280703133297

Offset

0,3

Links

Table of n, a(n) for n=0..21.

Crossrefs

Sequence in context: A116428 A121187 A011789 * A100525 A199033 A370695

Adjacent sequences: A047036 A047037 A047038 * A047040 A047041 A047042

Keyword

nonn

Author

Clark Kimberling

Status

approved