id:A115399 - OEIS Search Results

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Expansion of c(x^2-x^3), c(x) the g.f. of A000108.

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1, 0, -1, 1, 2, -4, -3, 15, -1, -51, 42, 154, -274, -372, 1341, 405, -5599, 2783, 20295, -27313, -61139, 160797, 124462, -767702, 94964, 3145986, -2930086, -10956466, 21290868, 29513156, -114974111, -33473459, 522016279, -279684579, -2031228003, 2867285041, 6493289367, -17791297065 (list; graph; listen)

	OFFSET	`0,5`
	COMMENT	`Diagonal sums of A115179.`
	FORMULA	`a(n)=sum{k=0..floor(n/2), (-1)^(n-k)*C(k)C(k,n-2k)}.`
	CROSSREFS	`Cf. A115178.` `Sequence in context: A125091 A091861 A079308 this_sequence A109429 A114894 A053124` `Adjacent sequences: A115396 A115397 A115398 this_sequence A115400 A115401 A115402`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 14 2006`

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Last modified September 8 08:06 EDT 2008. Contains 143486 sequences.

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