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Search: id:A092470
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| A092470 |
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a(n)=sum(i+j+k=n,(n+2i)!/(2*i)!/j!/k!) 0<=i<=j<=k<=n. |
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+0
1
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| 1, 3, 42, 774, 19440, 605520, 22856400, 1012258800, 51590125440, 2974547691360, 191478611348640, 13613255894921760, 1059445820574741600, 89583977589282015840, 8178390058456647469440, 801733426581997672963200
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) a(n)=sum(i=0, n, sum(j=0, i, sum(k=0, j, if(i+j+k-n, 0, (n+2*i)!/(2*i)!/j!/k!))))
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CROSSREFS
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Sequence in context: A084522 A003770 A097068 this_sequence A078601 A083402 A058808
Adjacent sequences: A092467 A092468 A092469 this_sequence A092471 A092472 A092473
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KEYWORD
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nonn
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AUTHOR
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Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 25 2004
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