A316884 Squares visited by moving diagonally one square on a spirally numbered board and moving to the lowest available unvisited square at each step.

1, 3, 11, 9, 23, 7, 19, 5, 15, 33, 13, 29, 53, 27, 25, 47, 77, 45, 21, 41, 69, 39, 17, 35, 61, 95, 59, 31, 55, 87, 127, 85, 51, 49, 79, 117, 163, 115, 75, 43, 71, 107, 151, 105, 67, 37, 63, 97, 139, 189, 137, 93, 57, 89, 129, 177, 233, 175, 125, 83, 81, 119

Offset: 1

Author

Daniël Karssen, Jul 15 2018

Keywords

• nonn

Comments

Board is numbered with the square spiral:

.

17--16--15--14--13

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18 5---4---3 12 .

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19 6 1---2 11 .

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20 7---8---9--10 .

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21--22--23--24--25--26

Links

• Daniël Karssen, Table of n, a(n) for n = 1..10000
• Daniël Karssen, Figure showing the first 49 steps of the sequence

Crossrefs

Cf. A316667, A316671.