A144706 - OEIS

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A144706

Central coefficients of Pascal-like triangle A132047.

1, 6, 18, 60, 210, 756, 2772, 10296, 38610, 145860, 554268, 2116296, 8112468, 31201800, 120349800, 465352560, 1803241170, 7000818660, 27225405900, 106035791400, 413539586460, 1614773623320 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Hankel transform is A144708.`
	FORMULA	`G.f.: 3/sqrt(1-4x)-2; a(n)=3C(2n,n)-20^n;` `a(n)=Sum_{k, 0<=k<=n} A039599(n,k)A010686(k)=Sum_{k, 0<=k<=} A106566(n,k)A082505(k+1). [From Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Oct 30 2008]`
	CROSSREFS	`Sequence in context: A075386 A056343 A119106 * A074427 A034751 A200151` `Adjacent sequences: A144703 A144704 A144705 * A144707 A144708 A144709`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Sep 19 2008`

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.