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 A308312 a(n) is the last square visited by knight moves on a spirally numbered (2n-1) X (2n-1) board, moving to the lowest available unvisited square at each step. 1
 1, 1, 14, 30, 69, 108, 150, 205, 264, 333, 408, 475, 553, 659, 763, 881, 1004, 1134, 1274, 1418, 1641, 1811, 1986, 2167, 2358, 2557, 2633, 2978, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084, 2084 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS A 5 X 5 board, for example, is numbered with the square spiral: .   21--22--23--24--25    |   20   7---8---9--10    |   |           |   19   6   1---2  11    |   |       |   |   18   5---4---3  12    |               |   17--16--15--14--13 . a(n) stays constant at 2084 for (2n-1) >= 57 since 2084 is also the last square visited by knight moves on a spirally numbered doubly infinite board, moving to the lowest available unvisited square at each step. LINKS CROSSREFS Cf. A316667. Sequence in context: A083540 A027575 A104776 * A101960 A075208 A228124 Adjacent sequences:  A308309 A308310 A308311 * A308313 A308314 A308315 KEYWORD nonn AUTHOR Sangeet Paul, May 19 2019 STATUS approved

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Last modified May 21 07:22 EDT 2022. Contains 353889 sequences. (Running on oeis4.)