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Search: id:A092469
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| A092469 |
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a(n)=sum(i+j+k=n,(n+2j)!/i!/(3j)!/k!) 0<=i<=j<=k<=n. |
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+0
1
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| 1, 1, 13, 91, 1081, 10606, 181189, 2025325, 38378449, 548523856, 10811257051, 176339404099, 3828413138785, 68734868302738, 1590128353317001, 31543123841374681, 768191679788034529, 16494997547298477340
(list; graph; listen)
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OFFSET
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0,3
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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*j)!/i!/(2*j)!/k!))))
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CROSSREFS
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Sequence in context: A010965 A022578 A090020 this_sequence A027670 A055608 A038742
Adjacent sequences: A092466 A092467 A092468 this_sequence A092470 A092471 A092472
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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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