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1, 13, 31, 55, 85, 121, 163, 211, 265, 325, 391, 463, 541, 625, 715, 811, 913, 1021, 1135, 1255, 1381, 1513, 1651, 1795, 1945, 2101, 2263, 2431, 2605, 2785, 2971, 3163, 3361, 3565, 3775, 3991, 4213, 4441, 4675, 4915, 5161, 5413, 5671, 5935, 6205
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| Vincenzo Librandi, Table of n, a(n) for n = 1..5000
Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| a(n)= a(n-1)+6n (with a(1)=1) .
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PROG
| (MAGMA) [-5+3*n^2+3*n: n in [1..50]].
(PARI) a(n)=3*n*(n+1)-5 \\ Charles R Greathouse IV, Jan 11 2012
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CROSSREFS
| Sequence in context: A106294 A101649 A063305 * A065768 A155820 A021007
Adjacent sequences: A166140 A166141 A166142 * A166144 A166145 A166146
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KEYWORD
| nonn,easy
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AUTHOR
| Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 08 2009
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EXTENSIONS
| New name from Charles R Greathouse IV, Jan 11 2012 following Paolo P. Lava
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