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 A098502 a(n) = 16*n - 4. 7
 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; text; internal format)
 OFFSET 1,1 COMMENTS For n > 3, the number of squares on the infinite 4-column chessboard at <= n knight moves from any fixed start point. LINKS Vincenzo Librandi, Table of n, a(n) for n = 1..5000 Tanya Khovanova, Recursive Sequences Index entries for linear recurrences with constant coefficients, signature (2,-1). Index entries for sequences which agree for a long time but are different EXAMPLE G.f.: 4*x*(3+x)/(1-x)^2. - Colin Barker, Jan 09 2012 MATHEMATICA Range[12, 1000, 16] (* Vladimir Joseph Stephan Orlovsky, May 31 2011 *) PROG (Magma) [16*n - 4: n in [1..60]]; // Vincenzo Librandi, Jul 24 2011 (PARI) a(n)=16*n-4 \\ Charles R Greathouse IV, Jul 10 2016 CROSSREFS Cf. A008590, A017629, A098498, A158953. Sequence in context: A184838 A044073 A044454 * A158953 A223454 A107707 Adjacent sequences: A098499 A098500 A098501 * A098503 A098504 A098505 KEYWORD nonn,easy AUTHOR Ralf Stephan, Sep 15 2004 STATUS approved

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Last modified June 14 21:28 EDT 2024. Contains 373401 sequences. (Running on oeis4.)