A081181 - OEIS

This site is supported by donations to The OEIS Foundation.

A081181

Staircase on Pascal's triangle.

1, 3, 6, 20, 35, 126, 210, 792, 1287, 5005, 8008, 31824, 50388, 203490, 319770, 1307504, 2042975, 8436285, 13123110, 54627300, 84672315, 354817320, 548354040, 2310789600, 3562467300, 15084504396, 23206929840, 98672427616, 151532656696 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Arrange Pascal's triangle as a square array. A081181 is then a diagonal staircase on the square array. A companion staircase is given by A065942.`
	FORMULA	`a(n) = binomial(floor((n + 1)/2) + (n + 1), n).`
	CROSSREFS	`Sequence in context: A058818 A184937 A176993 * A062164 A052408 A148573` `Adjacent sequences: A081178 A081179 A081180 * A081182 A081183 A081184`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 11 2003`

Content is available under The OEIS End-User License Agreement .

Last modified February 17 21:13 EST 2012. Contains 206085 sequences.