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12, 28, 44, 60, 76, 92, 108, 124, 140, 156, 172, 188, 204, 220, 236, 252, 268, 284, 300, 316, 332, 348, 364, 380, 396, 412, 428, 444, 460, 476, 492, 508, 524, 540, 556, 572, 588, 604, 620, 636, 652, 668, 684, 700, 716, 732, 748, 764, 780, 796, 812, 828, 844
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| For n>3, the number of squares on the infinite 4-column chessboard at <=n knight moves from any fixed start point.
General form (q*n-1)*q, cf. A017233 (q=3). [From Vladimir Orlovsky, Feb 16 2009]
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LINKS
| Tanya Khovanova, Recursive Sequences
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
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EXAMPLE
| G.f.: 4*x*(3+x)/(1-x)^2. [Colin Barker, Jan 09 2012]
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MATHEMATICA
| q=4; lst={}; Do[AppendTo[lst, (q*n-1)*q], {n, 0, 5!}]; lst [From Vladimir Orlovsky, Feb 16 2009]
Range[12, 1000, 16] (* From Vladimir Joseph Stephan Orlovsky, May 31 2011 *)
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PROG
| (MAGMA) [16*n - 4: n in [1..60]]; // Vincenzo Librandi, Jul 24 2011
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CROSSREFS
| Cf. A098498, A017629, A008590.
Sequence in context: A044073 A044454 * A158953 A107707 A183053 A126195
Adjacent sequences: A098499 A098500 A098501 * A098503 A098504 A098505
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KEYWORD
| nonn,easy
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AUTHOR
| Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 15 2004
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