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A001520
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(6n+1)(6n+3)(6n+5).
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0
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15, 693, 3315, 9177, 19575, 35805, 59163, 90945, 132447, 184965, 249795, 328233, 421575, 531117, 658155, 803985, 969903, 1157205, 1367187, 1601145, 1860375, 2146173, 2459835, 2802657, 3175935
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Sum_{k>=0} 1/a(k) = log(3)/16 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009]
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FORMULA
| G.f.: 3*(1+x)*(5+206*x+5*x^2)/(1-x)^4 [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Oct 20 2009]
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CROSSREFS
| Sequence in context: A171113 A166186 A177230 * A062079 A062032 A204251
Adjacent sequences: A001517 A001518 A001519 * A001521 A001522 A001523
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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