id:A099392 - OEIS Search Results

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Floor[(n^2-2*n+3)/2].

+0
5

1, 1, 3, 5, 9, 13, 19, 25, 33, 41, 51, 61, 73, 85, 99, 113, 129, 145, 163, 181, 201, 221, 243, 265, 289, 313, 339, 365, 393, 421, 451, 481, 513, 545, 579, 613, 649, 685, 723, 761, 801, 841, 883, 925, 969, 1013, 1059, 1105, 1153, 1201, 1251, 1301, 1353, 1405 (list; graph; listen)

	OFFSET	`1,3`
	FORMULA	`a(n)=ceiling(n^2/2)-n+1. - Paul Barry (pbarry(AT)wit.ie), Jul 16 2006; corrected by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 29 2007` `a(n) = ceiling( b(n)/2 where b(n) = A002522(n). - Branko Curgus (curgus(AT)cc.wwu.edu), Sep 02 2007`
	CROSSREFS	`Differs from A085913 at n = 61. Apart from leading term, identical to A080827.` `Sequence in context: A004132 A065802 A118028 this_sequence A080827 A102378 A118026` `Adjacent sequences: A099389 A099390 A099391 this_sequence A099393 A099394 A099395`
	KEYWORD	`nonn`
	AUTHOR	`Ralf Stephan following a suggestion from Luke Pebody, Oct 20 2004`

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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.

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