id:A011848 - OEIS Search Results

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[ C(n,2)/2 ].

+0
9

0, 0, 0, 1, 3, 5, 7, 10, 14, 18, 22, 27, 33, 39, 45, 52, 60, 68, 76, 85, 95, 105, 115, 126, 138, 150, 162, 175, 189, 203, 217, 232, 248, 264, 280, 297, 315, 333, 351, 370, 390, 410, 430, 451, 473, 495, 517, 540, 564, 588, 612, 637, 663, 689, 715, 742, 770, 798 (list; graph; listen)

	OFFSET	`0,5`
	FORMULA	`G.f.: x^3(1-x^2)/((1-x)^3(1-x^4)).` `G.f.: x^3/(1+x^2)(1-x)^3 - Jon Perry (perry(AT)globalnet.co.uk), Mar 31 2004`
	PROGRAM	`(PARI) a(n)=binomial(n, 2)\2`
	CROSSREFS	`A054925(n)=a(-n). A035608(n)=a(2n+1).` `A column of triangle A011857.` `First differences are in A004524.` `Adjacent sequences: A011845 A011846 A011847 this_sequence A011849 A011850 A011851` `Sequence in context: A057672 A112509 A054040 this_sequence A131673 A140261 A015827`
	KEYWORD	`nonn`
	AUTHOR	`njas`

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Last modified October 13 02:37 EDT 2008. Contains 145008 sequences.

AT&T Labs Research