1/20 of the number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

A183711

1/20 of the number of (n+1) X (n+1) 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

Terms

    a(0) =2a(1) =17a(2) =224a(3) =5362a(4) =224640a(5) =16823812a(6) =2239265280a(7) =532844962952

External references