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Search: id:A092471
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| A092471 |
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a(n)=sum(i+j+k=n,(n+i+j)!/(i+j)!/j!/k!) 0<=i<=n, 0<=j<=n, 0<=k<=n. |
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+0
1
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| 1, 5, 43, 495, 7281, 133173, 2945755, 76769759, 2306295265, 78492222693, 2985018589323, 125449316558415, 5773653823774929, 288808141870191765, 15601413322486382523, 905170780889312826303, 56136189828704013001665
(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, n, sum(k=0, n, if(i+j+k-n, 0, (n+i+j)!/(i+j)!/j!/k!))))
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CROSSREFS
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Sequence in context: A082311 A112115 A083070 this_sequence A093620 A107720 A060053
Adjacent sequences: A092468 A092469 A092470 this_sequence A092472 A092473 A092474
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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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