A008921 - OEIS

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A008921

Coordination sequence for lattice {E_7}*.

1, 56, 938, 7688, 39746, 150248, 455114, 1171928, 2668610, 5521880, 10585514, 19068392, 32622338, 53439752, 84361034, 128991800, 191829890, 278402168, 395411114, 550891208, 754375106, 1017069608 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`T. D. Noe, Table of n, a(n) for n=0..1000` `J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (Abstract, pdf, ps).`
	FORMULA	`G.f.: (x+1)(x^6+624x^5+1959x^4+1744x^3+519x^2+48x+1)/(1-x)^7.`
	MAPLE	`68/5n^6-216/5n^5+148n^4-192n^3+902/5n^2-264/5n+2;`
	CROSSREFS	`Sequence in context: A175602 A182866 A008389 * A114059 A002009 A140901` `Adjacent sequences: A008918 A008919 A008920 * A008922 A008923 A008924`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 17 08:44 EST 2012. Contains 205998 sequences.