A026650 a(n) = T(2n,n-1), T given by A026648.

1, 6, 21, 108, 370, 1908, 6587, 34248, 119142, 623700, 2182818, 11487528, 40391988, 213451560, 753295635, 3993910416, 14136717574, 75152083716, 266650874678, 1420670333640, 5050926317724, 26960309526744, 96015725922014

Offset

1,2

Links

Table of n, a(n) for n=1..23.

Crossrefs

Sequence in context: A318566 A083558 A060843 * A347948 A364328 A298837

Adjacent sequences: A026647 A026648 A026649 * A026651 A026652 A026653

Keyword

nonn

Author

Clark Kimberling

Status

approved