A046223 - OEIS

This site is supported by donations to The OEIS Foundation.

A046223

First denominator and then numerator of central elements of 1/2-Pascal triangle.

1, 1, 2, 1, 1, 3, 1, 11, 1, 40, 1, 147, 1, 546, 1, 2046, 1, 7722, 1, 29315, 1, 111826, 1, 428298, 1, 1646008, 1, 6344366, 1, 24515700, 1, 94942620, 1, 368404110, 1, 1431985635, 1, 5574725970, 1, 21732560850, 1, 84828633120, 1, 331488081210, 1 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,3`
	EXAMPLE	`1/1; 1/1 1/1; 1/1 1/2 1/1; 1/1 3/2 3/2 1/1; 1/1 5/2 3/1 5/2 1/1; 1/1 7/2 11/2 11/2 7/2 1/1; 1/1 9/2 9/1 11/1 9/1 9/2 1/1; 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ...`
	CROSSREFS	`Cf. A046213.` `Sequence in context: A003687 A104575 A173937 * A192181 A073463 A183568` `Adjacent sequences: A046220 A046221 A046222 * A046224 A046225 A046226`
	KEYWORD	`nonn`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 13 1999`

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

Last modified February 14 20:38 EST 2012. Contains 205663 sequences.