1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

A183717

1/20 of the number of (n+1) X 8 0..4 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease.

Terms

    a(0) =408a(1) =5776a(2) =71712a(3) =954496a(4) =12606120a(5) =168070828a(6) =2239265280a(7) =29887741084a(8) =398877017736

External references