1/16 the number of (n+1) X 3 0..7 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.
A183731
1/16 the number of (n+1) X 3 0..7 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) =21a(1) =290a(2) =13169a(3) =550268a(4) =19849923a(5) =667017027a(6) =21320890377a(7) =659741463420
External references
- oeis: A183731