A026074 a(n) = T(3n,n), where T is the array defined in A024996.

1, 1, 12, 91, 726, 5902, 48704, 406353, 3419020, 28958955, 246598716, 2109182557, 18106771400, 155929895685, 1346442959176, 11653675471305, 101071521560286, 878176794266261, 7642505705447340, 66606583068846975

Offset

0,3

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A001503 A004311 A160869 * A339715 A298397 A246585

Adjacent sequences: A026071 A026072 A026073 * A026075 A026076 A026077

Keyword

nonn

Author

Clark Kimberling

Status

approved