id:A118402 - OEIS Search Results

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Row sums of triangle A118401.

+0
4

1, 1, 3, 1, 5, -1, 7, -3, 9, -5, 11, -7, 13, -9, 15, -11, 17, -13, 19, -15, 21, -17, 23, -19, 25, -21, 27, -23, 29, -25, 31, -27, 33, -29, 35, -31, 37, -33, 39, -35, 41, -37, 43, -39, 45, -41, 47, -43, 49, -45, 51, -47, 53, -49, 55, -51, 57, -53, 59, -55, 61, -57, 63, -59, 65, -61, 67, -63, 69, -65, 71 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`G.f.: A(x) = (1+2x+2x^2)*(1+x^2)/(1+x)^2/(1-x). a(n^2-n+2) = A118403(n).`
	PROGRAM	`(PARI) {a(n)=polcoeff((1+2x+2x^2)(1+x^2)/(1+x+xO(x^n))^2/(1-x), n, x)}`
	CROSSREFS	`Cf. A118401, A118403.` `Sequence in context: A093178 A093411 A147088 this_sequence A122383 A136180 A095112` `Adjacent sequences: A118399 A118400 A118401 this_sequence A118403 A118404 A118405`
	KEYWORD	`sign`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Apr 27 2006`

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.

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