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Search: id:A166143
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| A166143 |
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a(n)= a(n-1)+6n (with a(1)=1) |
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+0
2
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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; listen)
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OFFSET
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1,2
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FORMULA
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a(n)=-5+3*n^2+3*n, with a(1)=1 [From Paolo P. Lava (ppl(AT)spl.at), Nov 10 2009]
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EXAMPLE
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For n=2, a(2)=1+12=13; n=3, a(3)=13+18=31; n=4, a(4)=31+24=55
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CROSSREFS
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Sequence in context: A106294 A101649 A063305 this_sequence A065768 A155820 A021007
Adjacent sequences: A166140 A166141 A166142 this_sequence A166144 A166145 A166146
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KEYWORD
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nonn,new
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AUTHOR
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Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Oct 08 2009
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