A131475 - OEIS

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A131475

floor(n/2) * floor(n^2/2).

0, 0, 2, 4, 16, 24, 54, 72, 128, 160, 250, 300, 432, 504, 686, 784, 1024, 1152, 1458, 1620, 2000, 2200, 2662, 2904, 3456, 3744, 4394, 4732, 5488, 5880, 6750, 7200, 8192, 8704, 9826, 10404, 11664, 12312, 13718, 14440, 16000, 16800 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..1000`
	FORMULA	`G.f.: 2x^2(1+x+3x^2+x^3)/((1+x)^3(1-x)^4). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Dec 19 2008]` `a(n) = +1a(n-1) +3a(n-2) -3a(n-3) -3a(n-4) +3a(n-5) +1a(n-6) -1*a(n-7).`
	PROG	`(MAGMA) [Floor(n/2)*Floor(n^2/2): n in [0..60]]; // Vincenzo Librandi, Jun 16 2011`
	CROSSREFS	`Cf. A000982; A008619; A004526; A007590.` `Sequence in context: A049441 A193868 A059622 * A045541 A153665 A015775` `Adjacent sequences: A131472 A131473 A131474 * A131476 A131477 A131478`
	KEYWORD	`nonn`
	AUTHOR	`Mohammad K. Azarian (azarian(AT)evansville.edu), Jul 27 2007`

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Last modified February 17 00:09 EST 2012. Contains 205978 sequences.