T(n,k)=Number of nXk array permutations with each element moved by a city block distance of no more than three.

A188962

T(n,k)=Number of nXk array permutations with each element moved by a city block distance of no more than three.

Terms

    a(0) =1a(1) =2a(2) =2a(3) =6a(4) =24a(5) =6a(6) =24a(7) =720a(8) =720a(9) =24a(10) =78a(11) =24024a(12) =229080a(13) =24024a(14) =78a(15) =230a(16) =570050a(17) =75764664a(18) =75764664a(19) =570050a(20) =230a(21) =675a(22) =12702057a(23) =17316382188a(24) =251096032912a(25) =17316382188a(26) =12702057a(27) =675a(28) =2069a(29) =298167456

External references