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Search: id:A144390
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| 1, 9, 23, 43, 69, 101, 139, 183, 233, 289, 351, 419, 493, 573, 659, 751, 849, 953, 1063, 1179, 1301, 1429, 1563, 1703, 1849, 2001, 2159, 2323, 2493, 2669, 2851, 3039, 3233, 3433, 3639, 3851, 4069, 4293, 4523, 4759, 5001, 5249, 5503, 5763, 6029, 6301, 6579
(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+1)=a(n)+6n+2, See A016933.
a(n)=3*n^2-n-1, [From Paolo P. Lava (ppl(AT)spl.at), Oct 06 2008]
G.f: x(1+6x-x^2)/(1-x)^3. a(n)=A049450(n)-1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
a(n)=6*n+a(n-1)-4 (with a(1)=1) [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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EXAMPLE
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For n=2, a(2)=6*2+1-4=9; n=3, a(3)=6*3+9-4=23; n=4, a(4)=6*4+23-4=43 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Nov 09 2009]
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MATHEMATICA
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s=-1; lst={}; Do[s+=n+1; AppendTo[lst, s], {n, 1, 6!, 6}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 25 2008]
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CROSSREFS
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Cf. A016933.
Sequence in context: A031023 A054302 A147395 this_sequence A024843 A159221 A079040
Adjacent sequences: A144387 A144388 A144389 this_sequence A144391 A144392 A144393
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KEYWORD
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nonn,new
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Oct 02 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
More terms and Mathematica program Vladimir Orlovsky (4vladimir(AT)gmail.com), Oct 25 2008
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