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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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1, 15, 648, 55440, 7875000, 1674728055, 498078806400, 197378293432320, 100519810139548800, 63970355423583984375, 49745967806568479846400, 46413542581052579412480000, 51171212156597654150866636800
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| 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
| 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
| Sequence in context: A203172 A081022 A049291 * A079600 A171113 A166186
Adjacent sequences: A092955 A092956 A092957 * A092959 A092960 A092961
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KEYWORD
| easy,nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Mar 25 2004
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EXTENSIONS
| 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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