id:A084779 - OEIS Search Results

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a(n) = sum of absolute-valued coefficients of (1+2x-4x^2)^n.

+0
1

1, 7, 41, 207, 1313, 7807, 42593, 232463, 1290433, 7604415, 42034721, 236031231, 1363681121, 7457831007, 39670144513, 231087069823, 1291433872385, 7373001299199, 41437235793921, 229538650588863, 1268719471103233 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) for(n=0, 40, S=sum(k=0, 2n, abs(polcoeff((1+2x-4*x^2)^n, k, x))); print1(S", "))`
	CROSSREFS	`Adjacent sequences: A084776 A084777 A084778 this_sequence A084780 A084781 A084782` `Sequence in context: A138629 A127923 A034575 this_sequence A081625 A097165 A026002`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Jun 14 2003`

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Last modified October 15 20:12 EDT 2008. Contains 145099 sequences.

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