Number of nX3 array permutations with each element moving one space diagonally, horizontally or vertically
0, 13, 48, 557, 3632, 30769, 229248, 1815601, 13960720, 108880333, 843387440
2 seqfan posts
Thu Apr 21 11:56:48 CEST 2011 [seqfan] Re: Symmetric Linear Recorrence Coefficients?