1/12 the number of (n+1) X 4 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.
A183723
1/12 the number of (n+1) X 4 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) =12a(1) =29a(2) =124a(3) =1790a(4) =30939a(5) =525895a(6) =8439116a(7) =130610844a(8) =1967828529a(9) =29070445544a(10) =422988995515
External references
- oeis: A183723