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Search: id:A092958
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| A092958 |
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a(1) = 1, a(2) = (1+2)*(2+3), a(3) = (1+2+3)*(2+3+4)*(3+4+5),... etc. Or a(n) = (T(n))*(T(n)+n)*(T(n)+2n)*(T(n)+3n)*... n terms. where T(n) = n(n+1)/2 given by A000210. |
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+0
1
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| 1, 15, 648, 55440, 7875000, 1674728055, 498078806400, 197378293432320, 100519810139548800, 63970355423583984375, 49745967806568479846400, 46413542581052579412480000, 51171212156597654150866636800
(list; graph; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=n^n*GAMMA(3n/2+1/2)/GAMMA(n/2+1/2). - Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 23 2006
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MAPLE
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a:=n->n^n*GAMMA(3*n/2+1/2)/GAMMA(n/2+1/2): seq(a(n), n=1..18); (Deutsch)
a:=n->mul(sum (j-k+n, j=1..n), k=1..n): seq(a(n), n=1..13); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2007
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CROSSREFS
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Sequence in context: A012210 A081022 A049291 this_sequence A079600 A166186 A001520
Adjacent sequences: A092955 A092956 A092957 this_sequence A092959 A092960 A092961
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2004
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EXTENSIONS
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More terms from Ray G. Opao (1260(AT)email.com), Mar 29 2004
More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jan 23 2006
More terms from Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 04 2007
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