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A010011
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a(0) = 1, a(n) = 21*n^2 + 2 for n>0.
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1
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1, 23, 86, 191, 338, 527, 758, 1031, 1346, 1703, 2102, 2543, 3026, 3551, 4118, 4727, 5378, 6071, 6806, 7583, 8402, 9263, 10166, 11111, 12098, 13127, 14198, 15311, 16466, 17663, 18902, 20183, 21506, 22871, 24278, 25727, 27218, 28751, 30326, 31943, 33602, 35303
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Bruno Berselli, Table of n, a(n) for n = 0..1000
Index to sequences with linear recurrences with constant coefficients, signature (3,-3,1).
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FORMULA
| O.g.f.: 1-x(23+17x+2x^2)/(-1+x)^3. - R. J. Mathar, Apr 12 2008
E.g.f.: (21*x*(x+1)+2)*e^x-1. - Gopinath A. R., Feb 13 2012
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MATHEMATICA
| Join[{1}, 21 Range[41]^2 + 2] (* Bruno Berselli, Feb 06 2012 *)
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CROSSREFS
| Cf. A206399.
Sequence in context: A104068 A060456 A056580 * A172117 A193018 A044210
Adjacent sequences: A010008 A010009 A010010 * A010012 A010013 A010014
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KEYWORD
| nonn,easy,changed
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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