id:A097074 - OEIS Search Results

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Expansion of (1-x+2x^2)/((1-x)(1-x-2x^2)).

+0
2

1, 1, 5, 9, 21, 41, 85, 169, 341, 681, 1365, 2729, 5461, 10921, 21845, 43689, 87381, 174761, 349525, 699049, 1398101, 2796201, 5592405, 11184809, 22369621, 44739241, 89478485, 178956969, 357913941, 715827881, 1431655765, 2863311529 (list; graph; listen)

	OFFSET	`0,3`
	COMMENT	`Partial sums of A097073.`
	FORMULA	`a(n)=2A001045(n+1)-1; a(n)=42^n/3+2(-1)^n/3-1.`
	CROSSREFS	`Sequence in context: A049744 A000323 A083943 this_sequence A050559 A082676 A110200` `Adjacent sequences: A097071 A097072 A097073 this_sequence A097075 A097076 A097077`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jul 22 2004`

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Last modified July 24 12:00 EDT 2008. Contains 142294 sequences.

AT&T Labs Research