A124014 a(n) = the sum of the terms in the n-th antidiagonal of A124975.

1, 2, 4, 8, 22, 138, 4952, 7139100, 21413761011002, 226852422426283857888381406, 25729877378683265674254171054115441638555802828935420, 331013294649039928470435095480789359495537067296709574238913964352421152489181126832086450397574900411936

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Mathematica

t[m_, n_] := t[m, n] = If[m == 1 || n == 1, 1, Product[t[k, n], {k, m - 1}] + Product[t[m, j], {j, n - 1}]]; Plus @@@ Table[t[d + 1 - j, j], {d, 12}, {j, d}] (* Ray Chandler, Dec 11 2006 *)

Crossrefs

Cf. A124975.

Sequence in context: A337720 A293912 A122623 * A100827 A034906 A018323

Adjacent sequences: A124011 A124012 A124013 * A124015 A124016 A124017

Keyword

easy,nonn

Author

Leroy Quet, Nov 23 2006

Extensions

Extended by Ray Chandler, Dec 11 2006

Status

approved