A026651 a(n) = T(2n,n-2), T given by A026648.

1, 9, 40, 240, 915, 5103, 18704, 101952, 368490, 1990890, 7154928, 38514528, 138086403, 742202055, 2658662560, 14283407616, 51156225342, 274842096462, 984532674800, 5291030979360, 18960255044654, 101937273452454, 365451691152864

Offset

2,2

Links

Table of n, a(n) for n=2..24.

Crossrefs

Sequence in context: A243718 A086349 A359724 * A129799 A357552 A093816

Adjacent sequences: A026648 A026649 A026650 * A026652 A026653 A026654

Keyword

nonn

Author

Clark Kimberling

Status

approved