A087539 - OEIS

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A087539

First differences of A011849.

0, 0, 1, 2, 3, 5, 7, 10, 12, 15, 18, 22, 26, 30, 35, 40, 46, 51, 57, 63, 70, 77, 84, 92, 100, 109, 117, 126, 135, 145, 155, 165, 176, 187, 199, 210, 222, 234, 247, 260, 273, 287, 301, 316, 330, 345, 360, 376, 392, 408, 425, 442, 460, 477, 495, 513 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,4`
	FORMULA	`[ C(n+1, 3)/3 ] - [ C(n, 3)/3 ].` `G.f.: [x^3(1-x+x^2)(1-x^2+x^3)]/[(1-x)^3(1+x^3+x^6)].`
	CROSSREFS	`Sequence in context: A119565 A119592 A191892 * A140690 A004684 A036607` `Adjacent sequences: A087536 A087537 A087538 * A087540 A087541 A087542`
	KEYWORD	`nonn,easy`
	AUTHOR	`Ralf Stephan (ralf(AT)ark.in-berlin.de), Oct 24 2003`

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Last modified February 17 19:13 EST 2012. Contains 206085 sequences.