id:A077272 - OEIS Search Results

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a(n) = Sum_{d|n} d^2*2^(d-1)*(n/d-1) for n > 0.

+0
2

0, 0, 1, 2, 11, 4, 57, 6, 159, 80, 441, 10, 1567, 12, 3197, 958, 8647, 16, 23301, 18, 53003, 6508, 124005, 22, 315755, 1624, 692345, 41786, 1615939, 28, 3795873, 30, 8414231, 248200, 18940065, 14978, 43126711, 36, 94634165, 1384918, 209905711, 40, 465656541 (list; graph; listen)

	OFFSET	`0,4`
	FORMULA	`G.f.: Sum_{m>0} (m-1)x^m(1+2x^m)/(1-2x^m)^3. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Jun 21 2003`
	EXAMPLE	`a(4) = 113 + 421 + 1680 = 11.`
	CROSSREFS	`Cf. A083413.` `Adjacent sequences: A077269 A077270 A077271 this_sequence A077273 A077274 A077275` `Sequence in context: A082264 A070532 A038217 this_sequence A009301 A087552 A124688`
	KEYWORD	`nonn`
	AUTHOR	`njas, Jun 13 2003`

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Last modified October 11 09:12 EDT 2008. Contains 144832 sequences.

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