A026077 a(n) = T(2n,n+1), where T is the array defined in A024996.

1, 6, 40, 232, 1352, 7854, 45683, 266214, 1554684, 9098740, 53357985, 313495934, 1845063496, 10876094870, 64203285600, 379498497900, 2245861126596, 13305537121404, 78907795361228, 468393492593496

Offset: 1

Author

Clark Kimberling

Keywords

• nonn