Number of nX4 array permutations with each element moving one space diagonally, horizontally or vertically
1, 45, 557, 12592, 237297, 4791913, 94635005, 1883785285, 37399042560
2 seqfan posts
Thu Apr 21 11:56:48 CEST 2011 [seqfan] Re: Symmetric Linear Recorrence Coefficients?