A047143 T(n,n-1), array T as in A047140.

1, 3, 8, 23, 80, 290, 1010, 3521, 12934, 48498, 180020, 666648, 2512214, 9569120, 36408682, 138417669, 529685612, 2038304708, 7852427512, 30259337658, 116937868076, 453269554872, 1759337897040, 6833437297968, 26582114114294

Offset: 1

Author

Clark Kimberling

Keywords

• nonn