%I
%S 1,0,0,0,0,0,0,254,0,0,0,0,0
%N Number of paths from (1,1) to (n,n) in an n X n grid using only the steps +(1,0), (1,0), +(0,1) and (0,1) which do not selfintersect and which avoid any point (p,q) satisfying "(p1)*n + q is prime".
%e One of the 254 prime avoiding paths for the n=8 case is 1,9,10,18,26,27,28,20,21,22,14,15,16,24,32,40,39,38,46,54,55,56,64
%K hard,more,nonn
%O 1,8
%A Joseph E. Cooper III (easonrevant(AT)gmail.com), Sep 22 2008
