A026090 a(n) = T(3n,n), where T is the array defined in A026082.

1, 3, 9, 68, 552, 4524, 37531, 314280, 2651418, 22503384, 191935926, 1643789136, 14126691568, 121764645876, 1052237509089, 9113317001712, 79084764081720, 687489330917088, 5985694255080435, 52187865620386860, 455587704842911596

Offset

0,2

Links

Table of n, a(n) for n=0..20.

Crossrefs

Sequence in context: A046239 A093351 A018543 * A119751 A276475 A084543

Adjacent sequences: A026087 A026088 A026089 * A026091 A026092 A026093

Keyword

nonn

Author

Clark Kimberling

Status

approved