Number of (n+1) X 2 0..2 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing rightwards and downwards.
A206505
Number of (n+1) X 2 0..2 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing rightwards and downwards.
Terms
- a(0) =81a(1) =549a(2) =3399a(3) =19797a(4) =111495a(5) =614367a(6) =3337695a(7) =17958813a(8) =95989473a(9) =510679479a(10) =2707979133a(11) =14326037895a(12) =75662455155a(13) =399129270627
External references
- oeis: A206505