Number of nX2 array permutations with each element moved by a city block distance of no more than three.

A188959

Number of nX2 array permutations with each element moved by a city block distance of no more than three.

Terms

    a(0) =2a(1) =24a(2) =720a(3) =24024a(4) =570050a(5) =12702057a(6) =298167456a(7) =7208117568a(8) =173161739904

External references