id:A128504 - OEIS Search Results

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Row sums of array A128503 (second convolution of Chebyshev's S(n,x)=U(n,x/2) polynomials).

+0
2

1, 3, 3, -2, -9, -9, 3, 18, 18, -4, -30, -30, 5, 45, 45, -6, -63, -63, 7, 84, 84, -8, -108, -108, 9, 135, 135, -10, -165, -165, 11, 198, 198, -12, -234, -234, 13, 273, 273, -14, -315, -315, 15, 360, 360, -16, -408, -408, 17, 459, 459 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Second convolution of A010892. Convolution of A099254 with A010892.`
	FORMULA	`a(n)=sum( A128503(n,m),m=0..floor(n/2)), n>=0.` `G.f.: 1/(1-x+x^2)^3.`
	CROSSREFS	`Sequence in context: A115055 A158468 A100052 this_sequence A058137 A164705 A073754` `Adjacent sequences: A128501 A128502 A128503 this_sequence A128505 A128506 A128507`
	KEYWORD	`sign,easy`
	AUTHOR	`Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de) Apr 04 2007`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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