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Search: id:A092466
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| A092466 |
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a(n)=sum(i+j+k=n,(n+k)!/i!/j!/(2*k)!) 0<=j<=i<=k<=n. |
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+0
1
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| 1, 1, 3, 16, 41, 166, 777, 2472, 9781, 44506, 150953, 597334, 2661881, 9337511, 37044451, 162468924, 582650861, 2315651686, 10035973071, 36558456606, 145470310301, 624753156831, 2302445024223, 9169599427426, 39098606269531
(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+k)!/i!/j!/(2*k)!))))
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CROSSREFS
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Sequence in context: A068415 A066875 A081270 this_sequence A004320 A089363 A000574
Adjacent sequences: A092463 A092464 A092465 this_sequence A092467 A092468 A092469
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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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