Number of ways to number the cells of an n X n square grid with 1,2,3,...,n^2 so that successive integers are in adjacent cells (horizontally or vertically).
1, 8, 40, 552, 8648, 458696, 2707056
1 seqfan posts
Sat Dec 10 21:05:06 CET 2011 [seqfan] Re: Quick question about self-avoiding walks