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Search: id:A139576
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| 0, 11, 26, 45, 68, 95, 126, 161, 200, 243, 290, 341, 396, 455, 518, 585, 656, 731, 810, 893, 980, 1071, 1166, 1265, 1368, 1475, 1586, 1701, 1820, 1943, 2070, 2201, 2336, 2475, 2618, 2765, 2916, 3071, 3230, 3393, 3560, 3731, 3906
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=2*n^2+9*n.
a(n)=4*n+a(n-1)+3 (with a(1)=0) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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EXAMPLE
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For n=2, a(2)=4*2+0+3=11; n=3, a(3)=4*3+11+3=26; n=4, a(4)=4*4+26+3=45 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 08 2009]
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MATHEMATICA
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s=0; lst={s}; Do[s+=n++ +11; AppendTo[lst, s], {n, 0, 7!, 4}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 19 2008]
Table[Sum[(2*i + n - 1), {i, 4, n}], {n, 3, 45}] [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jul 11 2009]
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CROSSREFS
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Cf. A014105, A014106, A033537, A130861, A139577, A139578, A139579, A139580, A139581.
Sequence in context: A161451 A100566 A101969 this_sequence A166137 A046806 A027521
Adjacent sequences: A139573 A139574 A139575 this_sequence A139577 A139578 A139579
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KEYWORD
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easy,nonn,new
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AUTHOR
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Omar E. Pol (info(AT)polprimos.com), May 19 2008
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