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A124014
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a(n) = the sum of the terms in the n-th antidiagonal of A124975.
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0
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1, 2, 4, 8, 22, 138, 4952, 7139100, 21413761011002, 226852422426283857888381406, 25729877378683265674254171054115441638555802828935420, 331013294649039928470435095480789359495537067296709574238913964352421152489181126832086450397574900411936
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OFFSET
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1,2
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LINKS
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MATHEMATICA
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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 *)
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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