A027140 a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027113.

1, 3, 12, 57, 264, 1261, 6141, 30276, 150853, 758145, 3836896, 19534086, 99957904, 513756551, 2650822585, 13724435509, 71275344341, 371177285715, 1937791196448, 10139548682524, 53165765660928, 279301910804937

Offset

0,2

Links

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

Crossrefs

Sequence in context: A334773 A192525 A106570 * A110309 A263667 A101106

Adjacent sequences: A027137 A027138 A027139 * A027141 A027142 A027143

Keyword

nonn

Author

Clark Kimberling

Status

approved