id:A084183 - OEIS Search Results

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Jacobsthal reverse-pair sequence.

+0
5

0, 1, 1, 5, 3, 21, 11, 85, 43, 341, 171, 1365, 683, 5461, 2731, 21845, 10923, 87381, 43691, 349525, 174763, 1398101, 699051, 5592405, 2796203, 22369621, 11184811, 89478485, 44739243, 357913941, 178956971, 1431655765, 715827883, 5726623061 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Reverses elements a(2n+1) and a(2n+2) in A001045.`
	FORMULA	`G.f.: x(1+2x+2x^2)/((1+x)(1+2x)(1-2x))` `a(n)=(52^n-60^n+4(-1)^n-3(-2)^n)/12 - Paul Barry (pbarry(AT)wit.ie), May 19 2003` `a(n) - 2*a(n-1) is a signed version of A000225. - Paul Curtz (bpcrtz(AT)free.fr), Mar 06 2008`
	CROSSREFS	`Sequence in context: A049457 A061037 A070262 this_sequence A099730 A072800 A154825` `Adjacent sequences: A084180 A084181 A084182 this_sequence A084184 A084185 A084186`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 19 2003`

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Last modified November 25 08:46 EST 2009. Contains 167481 sequences.

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