A132622 Column 1 of triangle A132620.

1, 1, 4, 30, 350, 5740, 123536, 3321624, 107639880, 4092614350, 178857328760, 8840820912456, 487923356530428, 29751272243893424, 1986797438749089240, 144242973684381865448, 11313546753639061322478, 953480924215847114528412

Offset

0,3

Comments

Triangle T=A132620 is defined by: antidiagonal k of T = antidiagonal k-1 of T^k (after appending '1' for even k) for k>0, with T(n,n)=1 for n>=0.

Links

Table of n, a(n) for n=0..17.

Crossrefs

Cf. A132620 (triangle), A132621 (column 0).

Sequence in context: A052316 A089918 A371041 * A218296 A118792 A317030

Adjacent sequences: A132619 A132620 A132621 * A132623 A132624 A132625

Keyword

nonn

Author

Paul D. Hanna, Aug 24 2007

Status

approved