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 A323809 Squares visited by a knight on a spirally numbered board and moving to the lowest available unvisited square at each step and if no unvisited squares are available move one step back. 5
 0, 9, 2, 5, 8, 3, 6, 1, 4, 7, 10, 13, 28, 31, 14, 11, 26, 23, 44, 19, 22, 43, 40, 17, 34, 37, 18, 15, 32, 29, 52, 25, 46, 21, 42, 69, 20, 39, 16, 33, 12, 27, 24, 45, 74, 41, 68, 103, 36, 61, 94, 57, 54, 85, 50, 47, 76, 113, 72, 107, 150, 67, 102, 63, 66, 35, 38, 65, 62 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Board is numbered with the square spiral:   16--15--14--13--12    |               |   17   4---3---2  11   .    |   |       |   |   18   5   0---1  10   .    |   |           |   19   6---7---8---9   .    |   20--21--22--23--24--25 Coincides with A316328 for the first 2016 terms. - N. J. A. Sloane, Jan 29 2019 LINKS Daniël Karssen, Table of n, a(n) for n = 0..99999 Daniël Karssen, Figure showing the first 1e5 steps of the sequence CROSSREFS The sequences involved in this set of related sequences are A316588, A316328, A316334, A316667, A323808, A323809, A323810, and A323811. Sequence in context: A082831 A085551 A316328 * A275967 A155799 A021112 Adjacent sequences:  A323806 A323807 A323808 * A323810 A323811 A323812 KEYWORD nonn AUTHOR Daniël Karssen, Jan 28 2019 STATUS approved

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Last modified September 15 20:35 EDT 2019. Contains 327087 sequences. (Running on oeis4.)