A001821 - OEIS

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A001821

Central factorial numbers.
(Formerly M5215 N2269)

1, 30, 1023, 44473, 2475473, 173721912, 15088541896, 1593719752240, 201529405816816, 30092049283982400, 5242380158902146624 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`a(n-3) is the coefficient of x^4 in Prod[k=0..n, x+k^2]. - R. Stephan, Aug 22 2004`
	REFERENCES	`J. Riordan, Combinatorial Identities, Wiley, 1968, p. 217.` `N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).` `N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).`
	CROSSREFS	`Fourth right-hand column of triangle A008955.` `Sequence in context: A061466 A180812 A160313 * A027488 A075187 A060076` `Adjacent sequences: A001818 A001819 A001820 * A001822 A001823 A001824`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`
	EXTENSIONS	`More terms from R. Stephan, Aug 22 2004`

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.