id:A087440 - OEIS Search Results

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Expansion of (1-2x-3x^2)/((1-2x)(1-4x)).

+0
3

1, 4, 13, 46, 172, 664, 2608, 10336, 41152, 164224, 656128, 2622976, 10488832, 41949184, 167784448, 671113216, 2684403712, 10737516544, 42949869568, 171799085056, 687195553792, 2748780642304, 10995119423488, 43980471402496 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Binomial transform is A087439. Second binomial transform of A084221 (with extra leading 1).`
	FORMULA	`a(n)=54^n/8+32^n/4-3*0^n/8`
	CROSSREFS	`Sequence in context: A026641 A149435 A149436 this_sequence A149437 A149438 A151448` `Adjacent sequences: A087437 A087438 A087439 this_sequence A087441 A087442 A087443`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 03 2003`

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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.

AT&T Labs Research