1/12 the number of (n+1) X 5 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.
A183724
1/12 the number of (n+1) X 5 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.
Terms
- a(0) =87a(1) =388a(2) =1790a(3) =14886a(4) =272215a(5) =7319684a(6) =200260149a(7) =5355252106a(8) =139489865583
External references
- oeis: A183724