A119359 - OEIS

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A119359

Central coefficients of number triangle A119326.

0, 1, 1, 7, 31, 106, 386, 1499, 5755, 21886, 83854, 323302, 1248534, 4828916, 18719364, 72711123, 282867795, 1101981430, 4298723990, 16788997874, 65641296578, 256895812108, 1006307847324, 3945185527582, 15478851119966 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,4`
	COMMENTS	`a(n)=A119326(2n,n+1). A119358(n)-a(n)=A071688(n).`
	FORMULA	`G.f.: (1/sqrt(1-4x)+(1/sqrt(1+4x^2)-1)-c(x)+xc(-x^2))/2, c(x) the g.f. of A000108; a(n)=(C(2n,n+1)+C((n-1)/2)sin(pin/2)-20^n-2C(n-1,n/2)sin(pi(n-1)/2))/2.`
	CROSSREFS	`Sequence in context: A139876 A107392 A054497 * A055366 A160607 A205492` `Adjacent sequences: A119356 A119357 A119358 * A119360 A119361 A119362`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), May 16 2006`

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Last modified February 17 06:27 EST 2012. Contains 205998 sequences.