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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
Tanya Khovanova, Recursive Sequences
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
Sequence in context: A184838 A044073 A044454 * A158953 A223454 A107707
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.)