id:A104508 - OEIS Search Results

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Absolute row sums of triangle A104505, which is equal to the right-hand side of the triangle A084610 of coefficients in (1+x-x^2)^n.

+0
3

1, 2, 4, 9, 20, 47, 103, 198, 512, 1161, 1985, 5590, 13005, 21684, 59294, 142273, 270858, 634187, 1526399, 3256372, 6779657, 16020364, 37758202, 79702477, 164647757, 424655100, 940639154, 1709638551, 4675803604, 10774789429 (list; graph; listen)

	OFFSET	`0,2`
	PROGRAM	`(PARI) a(n)=sum(k=0, n, abs(polcoeff((1+x-x^2)^n, n+k)))`
	CROSSREFS	`Cf. A104505.` `Sequence in context: A085748 A052806 A110198 this_sequence A036623 A001385 A039808` `Adjacent sequences: A104505 A104506 A104507 this_sequence A104509 A104510 A104511`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Mar 11 2005`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research