1/12 the number of (n+1) X 3 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.

A183722

1/12 the number of (n+1) X 3 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) =1a(1) =2a(2) =29a(3) =388a(4) =4170a(5) =41423a(6) =388998a(7) =3528126a(8) =31206553a(9) =270945278a(10) =2318825000a(11) =19619049541a(12) =164448364546

External references