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A018839 Squares on infinite chessboard at n moves from center using a {2,3} fairy knight. 3
1, 8, 32, 88, 192, 304, 372, 416, 472, 540, 608, 676, 744, 812, 880, 948, 1016, 1084, 1152, 1220, 1288, 1356, 1424, 1492, 1560, 1628, 1696, 1764, 1832, 1900, 1968, 2036, 2104, 2172, 2240, 2308, 2376, 2444, 2512, 2580, 2648, 2716, 2784, 2852, 2920, 2988 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
For n >= 8, a(n) = 68n - 72. - David W. Wilson
G.f.: (x+1)*(12*x^8 - 24*x^6 - 20*x^5 + 28*x^4 + 20*x^3 + 12*x^2 + 5*x + 1)/(x-1)^2. - Colin Barker, Oct 04 2012
MATHEMATICA
CoefficientList[Series[(x + 1) (12 x^8 - 24 x^6 - 20 x^5 + 28 x^4 + 20 x^3 + 12 x^2 + 5*x + 1)/(x - 1)^2, {x, 0, 50}], x] (* Vincenzo Librandi, Oct 16 2013 *)
CROSSREFS
Cf. A297740 (partial sums).
Sequence in context: A211633 A130809 A333174 * A008412 A014819 A033155
KEYWORD
nonn,easy
AUTHOR
STATUS
approved

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Last modified March 2 05:08 EST 2024. Contains 370460 sequences. (Running on oeis4.)