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A124066
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a(n) = the sum of the terms in the n-th antidiagonal of A124976.
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0
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1, 2, 3, 6, 19, 138, 5555, 5661606, 8017014805939, 549978189515061145367082, 75619002235584922846322716556474301506401613843, 615505010930370584284868847397460604890896977173300806488671348925702765535678512305286
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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, Sum[t[k, n], {k, m - 1}] * Sum[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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