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Search: id:A124529
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| 1, 2, 6, 29, 190, 1562, 15457, 179034, 2377092, 35599701, 593731310, 10914169312, 219252994039, 4779086510108, 112341582757512, 2833025331800643, 76293601822430388, 2185288262904326236, 66338823231846583471
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OFFSET
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0,2
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COMMENT
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Equals diagonal sums of triangle A124418: a(n) = Sum_{k=0..n} A124418(n+k,k) for n>=0 (conjecture).
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PROGRAM
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(PARI) {a(n)=sum(k=0, n, k!*((n+k)\2)!*((n+k+1)\2)!*polcoeff(polcoeff(exp((1+y)*(exp(x+x*O(x^n))-1)), (n+k)\2), k) *polcoeff(polcoeff(exp((1+y)*(exp(x+x*O(x^n))-1)), (n+k+1)\2), k))}
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CROSSREFS
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Cf. A124526, A124527, A124528; A124418.
Sequence in context: A027109 A107375 A020126 this_sequence A088957 A030538 A076978
Adjacent sequences: A124526 A124527 A124528 this_sequence A124530 A124531 A124532
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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), Nov 08 2006
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