Number of permutations of an n X 5 array with each element moving exactly one horizontally or vertically and without 2-loops.

A216797

Number of permutations of an n X 5 array with each element moving exactly one horizontally or vertically and without 2-loops.

Terms

    a(0) =0a(1) =10a(2) =0a(3) =292a(4) =0a(5) =10140a(6) =0a(7) =361200a(8) =0a(9) =12911864a(10) =0a(11) =461788640a(12) =0a(13) =16516859104a(14) =0a(15) =590766585904a(16) =0a(18) =0a(20) =0a(22) =0a(24) =0a(26) =0a(28) =0

External references