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Search: id:A007681
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| A007681 |
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(2n+1)^2 n!.
(Formerly M4632)
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+0
2
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| 1, 9, 50, 294, 1944, 14520, 121680, 1134000, 11652480, 130999680, 1600300800, 21115987200, 299376000000, 4539498163200, 73316942899200, 1256675067648000, 22784918188032000, 435717099417600000
(list; graph; listen)
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OFFSET
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0,2
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REFERENCES
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N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
H. W. Gould, A class of binomial sums and a series transformation, Utilitas Math., 45 (1994), 71-83.
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CROSSREFS
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Sequence in context: A116169 A084367 A006974 this_sequence A115366 A002462 A034814
Adjacent sequences: A007678 A007679 A007680 this_sequence A007682 A007683 A007684
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com).
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