id:A015219 - OEIS Search Results

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Odd tetrahedral numbers.

+0
5

1, 35, 165, 455, 969, 1771, 2925, 4495, 6545, 9139, 12341, 16215, 20825, 26235, 32509, 39711, 47905, 57155, 67525, 79079, 91881, 105995, 121485, 138415, 156849, 176851, 198485, 221815, 246905, 273819, 302621, 333375, 366145, 400995, 437989 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Sum_{n>=0} 1/a(n) = (3/2)*log(2) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009]`
	FORMULA	`(4n+1)(4n+2)(4n+3) / 6.` `G.f.: (1+x)(1+30x+x^2)/(1-x)^4 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009]`
	CROSSREFS	`Cf. A000292.` `Sequence in context: A005339 A045614 A154074 this_sequence A033851 A101954 A005937` `Adjacent sequences: A015216 A015217 A015218 this_sequence A015220 A015221 A015222`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from Erich Friedman (erich.friedman(AT)stetson.edu).`

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Last modified December 10 00:48 EST 2009. Contains 170565 sequences.

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