Number of nX4 array permutations with every element making zero or one right-handed knight moves (out 2, right 1)
1, 4, 72, 729, 6480, 63504, 635040, 6350400, 63504000, 635040000, 6350400000
1 seqfan posts
Sat Mar 10 16:56:20 CET 2012 [seqfan] Right-handed knight permutations, powers of 10?