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Search: id:A085356
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| A085356 |
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Polygorial(n,3)/Polygorial(3,n), n>=3. |
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+0
8
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| 1, 5, 45, 630, 12600, 340200, 11907000, 523908000, 28291032000, 1838917080000, 141596615160000, 12743695364400000, 1325344317897600000, 157715973829814400000, 21291656467024944000000
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OFFSET
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0,2
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FORMULA
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A085356(n) = Polygorial(n+3, 3)/Polygorial(3, n+3) = (n+1)!^2*(n+2)*(n+3)*(n+4)/2^n/24 = A067550(n+2)/2
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MAPLE
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a := n->(n+1)!^2*(n+2)*(n+3)*(n+4)/2^n/24; [seq(a(j), j=0..15)];
seq(mul(binomial(k, 2)-binomial(k, 1), k =5..n), n=4..18 ); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Aug 07 2007
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CROSSREFS
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Cf. A067550, A084939, A084940, A084941, A084942, A084943, A084944.
Adjacent sequences: A085353 A085354 A085355 this_sequence A085357 A085358 A085359
Sequence in context: A090136 A090356 A112940 this_sequence A113382 A132688 A050641
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KEYWORD
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easy,nonn
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AUTHOR
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Daniel Dockery (peritus(AT)gmail.com) Jun 13 2003
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