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A093887
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A093886(n)/(1!*2!*3!...n!).
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1
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1, 1, 2, 140, 105, 840840, 51051, 79755701025, 143400750442950, 122535439350874224675, 46705681584242830001657805, 65358008635496174751045143339993779875
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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EXAMPLE
| a(4) = 140 = 8! /(1!*2!*3!*4!) = 40320/288.
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MAPLE
| a:=proc(n) local A, k: A:={}: for k from 1 to n*(n+1)/2 do if type(k!/product(j!, j=1..n), integer)=true then A:=A union {k} else A:=A fi od: A[1]!/product(i!, i=1..n); end: seq(a(n), n=1..14); # not necessarily the best Maple program (Deutsch)
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CROSSREFS
| Cf. A093886.
Sequence in context: A152509 A094482 A101232 * A152005 A140898 A120814
Adjacent sequences: A093884 A093885 A093886 * A093888 A093889 A093890
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 23 2004
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EXTENSIONS
| More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Feb 03 2006
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