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A007681
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(2n+1)^2 n!.
(Formerly M4632)
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1
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1, 9, 50, 294, 1944, 14520, 121680, 1134000, 11652480, 130999680, 1600300800, 21115987200, 299376000000, 4539498163200, 73316942899200, 1256675067648000, 22784918188032000, 435717099417600000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| H. W. Gould, A class of binomial sums and a series transformation, Utilitas Math., 45 (1994), 71-83.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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CROSSREFS
| Sequence in context: A084367 A006974 A171480 * A115366 A188210 A002462
Adjacent sequences: A007678 A007679 A007680 * A007682 A007683 A007684
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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