A080421 - OEIS

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A080421

(n+1)(n+2)(n+9)3^n/18.

1, 10, 66, 360, 1755, 7938, 34020, 139968, 557685, 2165130, 8227494, 30705480, 112842639, 409209570, 1466777160, 5203870272, 18294856425, 63795240522, 220829678730, 759344158440, 2595329855811, 8821564534530, 29832927334956 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (1-2x)/(1-3x)^4` `a(n)=A006503(n+1)*3^(n-1)`
	CROSSREFS	`T(n, 3) in triangle A080419` `Sequence in context: A159838 A024391 A074362 * A004310 A026853 A177452` `Adjacent sequences: A080418 A080419 A080420 * A080422 A080423 A080424`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Feb 19 2003`

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Last modified February 13 16:42 EST 2012. Contains 205523 sequences.