A038707 - OEIS

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A038707

Floor(n*(n+1/2)/2).

0, 0, 2, 5, 9, 13, 19, 26, 34, 42, 52, 63, 75, 87, 101, 116, 132, 148, 166, 185, 205, 225, 247, 270, 294, 318, 344, 371, 399, 427, 457, 488, 520, 552, 586, 621, 657, 693, 731, 770, 810, 850, 892, 935, 979, 1023, 1069, 1116, 1164, 1212, 1262 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Index entries for sequences related to Beatty sequences`
	FORMULA	`(1/8) {4n^2 + 2n - 3 + (-1)^n - 2(-1)^[(n-1)/2] }. - Ralf Stephan, Jun 10 2005`
	CROSSREFS	`Sequence in context: A129726 A122489 A120615 * A071705 A190713 A109094` `Adjacent sequences: A038704 A038705 A038706 * A038708 A038709 A038710`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com), May 02 2000`

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Last modified February 14 22:19 EST 2012. Contains 205675 sequences.