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Search: id:A103370
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| 1, 3, 12, 57, 303, 1743, 10629, 67791, 448023, 3047745, 21235140, 150969195, 1091936745, 8016114681, 59616180828, 448459155063, 3407842605039, 26131449100821, 202011445055436, 1573171285950639, 12333030718989969
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OFFSET
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1,2
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COMMENT
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Equals A008277 * A000108, i.e. the product of the Stirling2 triangle and the Catalan series starting (1, 2, 5, 14, 42,...). - Gary W. Adamson (qntmpkt(AT)yahoo.com), Jan 31 2008
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PROGRAM
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(PARI) {a(n)=if(n<1, 0, sum(k=1, n, (matrix(n, n, m, j, binomial(m-1, j-1)*binomial(m, j-1)/j)^2)[n, k]))}
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CROSSREFS
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Cf. A095801, A001263.
Cf. A008277, A000108.
Sequence in context: A101106 A133158 A047891 this_sequence A094149 A117107 A128326
Adjacent sequences: A103367 A103368 A103369 this_sequence A103371 A103372 A103373
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Feb 02 2005
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