id:A166136 - OEIS Search Results

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n*(n+3)/2+7.

+0
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9, 12, 16, 21, 27, 34, 42, 51, 61, 72, 84, 97, 111, 126, 142, 159, 177, 196, 216, 237, 259, 282, 306, 331, 357, 384, 412, 441, 471, 502, 534, 567, 601, 636, 672, 709, 747, 786, 826, 867, 909, 952, 996, 1041, 1087, 1134, 1182, 1231, 1281, 1332, 1384, 1437 (list; graph; listen)

	OFFSET	`1,1`
	FORMULA	`a(n)=a(n-1)+n = 3a(n-1) -3a(n-2) +a(n-3) = A145018(n+2)+2.` `G.f.: -x(9-15x+7*x^2)/(x-1)^3.`
	EXAMPLE	`a(2)=25/2+7=12. a(3)=36/2+7=16.`
	CROSSREFS	`Sequence in context: A048699 A019468 A084799 this_sequence A120154 A084375 A076674` `Adjacent sequences: A166133 A166134 A166135 this_sequence A166137 A166138 A166139`
	KEYWORD	`nonn,easy`
	AUTHOR	`Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 08 2009`
	EXTENSIONS	`Definition replaced by polynomial - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 12 20`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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