id:A084777 - OEIS Search Results

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a(n) = sum of absolute-valued coefficients of (1+2x-2x^2)^n.

+0
1

1, 5, 17, 73, 273, 881, 3785, 13081, 48737, 184321, 632193, 2526305, 8854081, 32077921, 124093025, 428178641, 1638563969, 5878561921, 21469361537, 82252171393, 286863949025, 1061000856417, 3998983314849, 14361380710817 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) for(n=0, 40, S=sum(k=0, 2n, abs(polcoeff((1+2x-2*x^2)^n, k, x))); print1(S", "))`
	CROSSREFS	`Sequence in context: A096980 A128887 A017957 this_sequence A102387 A126956 A009234` `Adjacent sequences: A084774 A084775 A084776 this_sequence A084778 A084779 A084780`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jun 14 2003`

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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