%I
%S 1,2016,3723,13103,14570,26967,101250,158735,132688,220439,144841,
%T 646728,350720,66183,75259,248764,118694,307483,238208,189159,139639,
%U 183821,151016,171076,114187,262235,178612,257632,124475,178862,143674,196795,60707,309820
%N On a spirally numbered chessboard, with labels starting at 1, this is the number of steps that a (1,n) leaper makes before getting trapped, or 1 if it never gets trapped.
%C A (1,2) leaper is a chess knight.
%C a(2)a(5) were computed by _Daniël Karssen_.
%H Rémy Sigrist, <a href="/A323469/b323469.txt">Table of n, a(n) for n = 1..1000</a>
%H Neil Sloane and Brady Haran, <a href="https://www.youtube.com/watch?v=RGQe8waGJ4w">The Trapped Knight</a>, Numberphile video (2019)
%Y 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.
%K sign
%O 1,2
%A _N. J. A. Sloane_, Jan 28 2019
%E More terms from _Rémy Sigrist_, Jan 29 2019
