A080610 - OEIS

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A080610

Partial sums of Jacobsthal gap sequence.

0, 1, 4, 5, 20, 21, 84, 85, 340, 341, 1364, 1365, 5460, 5461, 21844, 21845, 87380, 87381, 349524, 349525, 1398100, 1398101, 5592404, 5592405, 22369620, 22369621, 89478484, 89478485, 357913940, 357913941, 1431655764, 1431655765, 5726623060 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(2n-1)=A001045(2n)=A002450(n) a(2n)=A001045(2n)-1=A002450(n)-1` `G.f. x(1+4x)/((1-x^2)*(1-4x^2)). - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 16 2003` `a(n)=2^n+(-2)^n/3-(-1)^n/2-5/6. - Paul Barry (pbarry(AT)wit.ie), Apr 22 2004`
	CROSSREFS	`Cf. A080924.` `Sequence in context: A099897 A050251 A125995 * A047175 A133632 A163141` `Adjacent sequences: A080607 A080608 A080609 * A080611 A080612 A080613`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 26 2003`

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Last modified February 14 23:53 EST 2012. Contains 205689 sequences.