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A144390
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First bisection of A135370.
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6
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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; 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..1000
Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| a(n+1)=a(n)+6*n+2, See A016933.
a(n)=3*n^2-n-1, [From Paolo P. Lava (paoloplava(AT)gmail.com), Oct 06 2008]
G.f: x*(1+6*x-x^2)/(1-x)^3. a(n)=A049450(n)-1. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
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MATHEMATICA
| 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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PROG
| (MAGMA) [3*n^2-n-1: n in [1..60]]; // Vincenzo Librandi, Jun 14 2011
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CROSSREFS
| Cf. A016933.
Sequence in context: A199714 A054302 A147395 * A024843 A183453 A159221
Adjacent sequences: A144387 A144388 A144389 * A144391 A144392 A144393
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KEYWORD
| nonn,easy
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Oct 02 2008
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EXTENSIONS
| 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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