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Search: id:A124066
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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
1
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| 1, 2, 3, 6, 19, 138, 5555, 5661606, 8017014805939, 549978189515061145367082, 75619002235584922846322716556474301506401613843, 61550501093037058428486884739746060489089697717330080648867134892570276553567851\ 2305286
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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Leroy Quet, Home Page (listed in lieu of email address)
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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}] (*Chandler*)
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CROSSREFS
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Cf. A124976.
Sequence in context: A121959 A075633 A141048 this_sequence A093447 A002078 A000372
Adjacent sequences: A124063 A124064 A124065 this_sequence A124067 A124068 A124069
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KEYWORD
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easy,nonn
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AUTHOR
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Leroy Quet Nov 23 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Dec 11 2006
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