id:A112556 - OEIS Search Results

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Sums of squared terms in rows of triangle A112555.

+0
4

1, 2, 2, 4, 10, 32, 112, 408, 1514, 5680, 21472, 81644, 311896, 1196132, 4602236, 17757184, 68680170, 266200112, 1033703056, 4020716124, 15662273840, 61092127492, 238582873476, 932758045124, 3650336341240, 14298633670932 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`First differences form A072547 and equals the unsigned central terms of triangle A112555.`
	FORMULA	`G.f.: ( 2(1+x)/(1-x) + x/(1-4x)^(1/2) )/(2+x).`
	PROGRAM	`(PARI) {a(n)=local(x=X+XO(X^n)); polcoeff((2(1+x)/(1-x)+x/(1-4*x)^(1/2))/(2+x), n, X)}`
	CROSSREFS	`Cf. A112555, A072547.` `Sequence in context: A132824 A078801 A002420 this_sequence A054100 A034165 A006181` `Adjacent sequences: A112553 A112554 A112555 this_sequence A112557 A112558 A112559`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Sep 21 2005`

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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.

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