id:A102083 - OEIS Search Results

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A102083

8*n^2+4*n+1.

+0
4

1, 13, 41, 85, 145, 221, 313, 421, 545, 685, 841, 1013, 1201, 1405, 1625, 1861, 2113, 2381, 2665, 2965, 3281, 3613, 3961, 4325, 4705, 5101, 5513, 5941, 6385, 6845, 7321, 7813, 8321, 8845, 9385, 9941, 10513, 11101, 11705, 12325, 12961, 13613, 14281, 14965, 15665 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`If Y and Z are 2-blocks of a 2n-set X then, for n>=2, a(n-2) is the number of 4-subsets of X intersecting both Y and Z. - Milan R. Janjic (agnus(AT)blic.net), Nov 18 2007`
	LINKS	`Milan Janjic, Two Enumerative Functions`
	FORMULA	`G.f.: (1+10x+5x^2)/(1-x)^3 - Paul Barry (pbarry(AT)wit.ie), Jun 04 2005`
	CROSSREFS	`Cf. A085601.` `Sequence in context: A043942 A004624 A045473 this_sequence A139866 A026918 A123972` `Adjacent sequences: A102080 A102081 A102082 this_sequence A102084 A102085 A102086`
	KEYWORD	`nonn`
	AUTHOR	`njas, Feb 14 2005`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research