23953408

Appears in sequences

• Number of ways to place n nonattacking nightriders on an n X n toroidal board.at n=15A190393
• Number of (2+1) X (n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 1,0 1,1 0,-1 or -1,1.at n=19A264570
• a(n) = 2^(n-7)*(n^4 - 6*n^3 + 59*n^2 - 54*n)/3.at n=17A384506