id:A166137 - OEIS Search Results

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5*n*(n+1)/2-4.

+0
2

1, 11, 26, 46, 71, 101, 136, 176, 221, 271, 326, 386, 451, 521, 596, 676, 761, 851, 946, 1046, 1151, 1261, 1376, 1496, 1621, 1751, 1886, 2026, 2171, 2321, 2476, 2636, 2801, 2971, 3146, 3326, 3511, 3701, 3896, 4096, 4301, 4511, 4726, 4946, 5171, 5401, 5636 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n)= a(n-1)+5n = 3a(n-1) -3a(n-2) +a(n-3) = A166151(n)-1.` `G.f.: x(-1-8x+4*x^2)/(x-1)^3.`
	EXAMPLE	`a(2) = 103/2-4 = 11. a(3) = 154/2-4 = 26.`
	CROSSREFS	`Sequence in context: A100566 A101969 A139576 this_sequence A046806 A027521 A137014` `Adjacent sequences: A166134 A166135 A166136 this_sequence A166138 A166139 A166140`
	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 2009`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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