Number of n X 4 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order.

A222942

Number of n X 4 0..4 arrays with no element equal to another at a city block distance of exactly two, and new values 0..4 introduced in row major order.

Terms

    a(0) =7a(1) =273a(2) =5880a(3) =130680a(4) =2883000a(5) =63772920a(6) =1409319480a(7) =31155452280a(8) =688658403000

External references