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Search: id:A125558
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| 1, 1, 6, 50, 490, 5292, 60984, 736164, 9202050, 118195220, 1551580888, 20734762776, 281248448936, 3863302870000, 53644719852000, 751920156592200, 10626401036545650, 151269944167296900, 2167317913508055000
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OFFSET
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0,3
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COMMENT
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[1,6,50,490,5292,...] is a column in triangle of Narayana numbers A001263.
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FORMULA
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a(0)=1, a(n)=Catalan(n)^2*(n+1)/2 = A000108(n)^2*(n+1)/2 for n>0 . a(n)=A090181(2*n,n).
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MAPLE
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seq(ceil(1/2*(n+1)*((binomial(2*n, n)/(1+n))^2)), n=0..18); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 18 2007
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CROSSREFS
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Sequence in context: A027330 A090409 A039742 this_sequence A005416 A105617 A094072
Adjacent sequences: A125555 A125556 A125557 this_sequence A125559 A125560 A125561
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KEYWORD
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easy,nonn
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AUTHOR
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Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jan 01 2007, Oct 11 2007
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