%I #23 Feb 04 2019 08:36:03
%S 1,10,3,6,9,4,7,2,5,8,11,14,18,15,12,16,19,22,41,17,33,30,34,13,27,23,
%T 20,24,44,40,21,39,36,60,31,53,26,46,25,28,32,29,51,47,75,42,45,71,74,
%U 70,38,35,59,56,86,50,78,49,52,80,83,79,115,73,107,67,64
%N Squares visited by gnu (A.K.A. wildebeest; (1,2)+(1,3)-leaper chess piece) moves on a spirally numbered board and moving to the lowest available unvisited square at each step.
%C In fairy chess the (1,2)+(1,3)-leaper is called a Gnu. - _Vaclav Kotesovec_, Jan 28 2019
%C Board is numbered with the square spiral:
%C .
%C 17--16--15--14--13
%C | |
%C 18 5---4---3 12 .
%C | | | |
%C 19 6 1---2 11 .
%C | | |
%C 20 7---8---9--10 .
%C |
%C 21--22--23--24--25--26
%C .
%C This sequence is finite: At step 12899744968 square 12851850258 is visited, after which there are no unvisited squares within one move.
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Fairy_chess_piece">Fairy chess piece</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Wildebeest_Chess">Wildebeest Chess</a>
%Y Cf. A316667, A317106.
%K nonn,fini
%O 1,2
%A _Jonathan Allan_, Jan 26 2019