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Search: id:A001821
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| A001821 |
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Central factorial numbers.
(Formerly M5215 N2269)
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+0
2
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| 1, 30, 1023, 44473, 2475473, 173721912, 15088541896, 1593719752240, 201529405816816, 30092049283982400, 5242380158902146624
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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a(n-3) is the coefficient of x^4 in Prod[k=0..n, x+k^2]. - R. Stephan, Aug 22 2004
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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).
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
J. Riordan, Combinatorial Identities, Wiley, 1968, p. 217.
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CROSSREFS
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Fourth right-hand column of triangle A008955.
Sequence in context: A004994 A061466 A160313 this_sequence A027488 A075187 A060076
Adjacent sequences: A001818 A001819 A001820 this_sequence A001822 A001823 A001824
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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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EXTENSIONS
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More terms from R. Stephan, Aug 22 2004
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