A002671 - OEIS

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A002671

4^n*(2*n+1)!.
(Formerly M5174 N2246)

1, 24, 1920, 322560, 92897280, 40874803200, 25505877196800, 21424936845312000, 23310331287699456000, 31888533201572855808000, 53572735778642397757440000, 108431217215972213061058560000 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	REFERENCES	`H. E. Salzer, Tables of coefficients for obtaining central differences from their derivatives, Journal of Mathematics and Physics, 42 (1963), 162-165. Note that there is a mistake in the definition of this sequence on line 2 of page 164.` `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).`
	LINKS	`Index to divisibility sequences`
	PROG	`(PARI) a(n)=4^n(2n+1)!`
	CROSSREFS	`A002671(n) = A002866(2n+1).` `Sequence in context: A166788 A123794 A006685 * A003738 A194472 A001501` `Adjacent sequences: A002668 A002669 A002670 * A002672 A002673 A002674`
	KEYWORD	`nonn,easy`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)`
	EXTENSIONS	`More terms from Michael Somos`

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Last modified February 15 18:22 EST 2012. Contains 205835 sequences.