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A124066
a(n) = the sum of the terms in the n-th antidiagonal of A124976.
0
1, 2, 3, 6, 19, 138, 5555, 5661606, 8017014805939, 549978189515061145367082, 75619002235584922846322716556474301506401613843, 615505010930370584284868847397460604890896977173300806488671348925702765535678512305286
OFFSET
1,2
MATHEMATICA
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 *)
CROSSREFS
Cf. A124976.
Sequence in context: A075633 A141048 A326030 * A319204 A093447 A321203
KEYWORD
easy,nonn
AUTHOR
Leroy Quet, Nov 23 2006
EXTENSIONS
Extended by Ray Chandler, Dec 11 2006
STATUS
approved