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A162607
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a(n) = n(n^2 - 4n + 5)/2.
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2
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0, 1, 1, 3, 10, 25, 51, 91, 148, 225, 325, 451, 606, 793, 1015, 1275, 1576, 1921, 2313, 2755, 3250, 3801, 4411, 5083, 5820, 6625, 7501, 8451, 9478, 10585, 11775, 13051, 14416, 15873, 17425, 19075, 20826, 22681, 24643, 26715, 28900, 31201, 33621
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,4
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COMMENTS
| Positive values are the row sums of triangle A159798.
The formula and the first positive terms of this sequence is mentioned in the comment lines in the entry A159798.
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FORMULA
| a(n) = n*(n^2-4*n+5)/2. [R. J. Mathar]
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MATHEMATICA
| f[n_]:=(n^3-n^2)/2+1; Table[f[n], {n, 0, 5!}] [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Feb 07 2010]
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CROSSREFS
| Cf. A159798.
Sequence in context: A192912 A168062 A176952 * A047667 A192963 A000247
Adjacent sequences: A162604 A162605 A162606 * A162608 A162609 A162610
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KEYWORD
| easy,nonn
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AUTHOR
| R. J. Mathar (mathar(AT)strw.leidenuniv.nl) and Omar E. Pol (info(AT)polprimos.com), Jul 21 2009
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