id:A162607 - OEIS Search Results

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a(n) = n(n^2 - 4n + 5)/2.

+0
3

0, 1, 1, 3, 10, 25, 51, 91, 148, 225, 325, 451, 606, 793, 1015, 1275, 1576, 1921, 2313, 2755, 3250, 3801, 4411, 5083, 5820, 6625, 7501, 8451, 9478, 10585, 11775, 13051, 14416, 15873, 17425, 19075, 20826, 22681, 24643, 26715, 28900, 31201, 33621 (list; graph; listen)

	OFFSET	`0,4`
	COMMENT	`Positive values are the row sums of triangle A159798.` `The formula and the first positive terms of this sequence is mentioned in the comment lines in the entry A159798.`
	FORMULA	`a(n) = n(n^2-4n+5)/2. [R. J. Mathar]`
	CROSSREFS	`Cf. A159798.` `Sequence in context: A033811 A062446 A053208 this_sequence A047667 A000247 A097763` `Adjacent sequences: A162604 A162605 A162606 this_sequence A162608 A162609 A162610`
	KEYWORD	`easy,nonn`
	AUTHOR	`R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Omar E. Pol (info(AT)polprimos.com), Jul 21 2009`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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