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A323470
On a spirally numbered square grid, with labels starting at 0, this is the number of the final step that a (1,n) leaper makes before getting trapped, or -1 if it never gets trapped.
7
-1, 2015, 3722, 13102, 14569, 26966, 101249, 158734, 132687, 220438, 144840, 646727, 350719, 66182, 75258, 248763, 118693, 307482, 238207, 189158, 139638, 183820, 151015, 171075, 114186, 262234, 178611, 257631, 124474, 178861, 143673, 196794, 60706, 309819
OFFSET
1,2
COMMENTS
A (1,2) leaper is a chess knight.
a(2)-a(5) were computed by Daniël Karssen.
LINKS
N. J. A. Sloane and Brady Haran, The Trapped Knight, Numberphile video (2019)
PROG
(C++) See Links section.
CROSSREFS
The sequences involved in this set of related sequences are A316884, A316967, A316667, A316328, A317106, A317105, A317416, A317415, A317438, A317437, and A323469, A323470, A323471, A323472.
Sequence in context: A191421 A250836 A076666 * A309918 A189188 A076582
KEYWORD
sign
AUTHOR
N. J. A. Sloane, Jan 28 2019
EXTENSIONS
More terms from Rémy Sigrist, Jan 29 2019
STATUS
approved