Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.
A206143
Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly three counterclockwise and three clockwise edge increases.
Terms
- a(0) =81a(1) =60a(2) =162a(3) =486a(4) =1458a(5) =4374a(6) =13122a(7) =39366a(8) =118098a(9) =354294a(10) =1062882a(11) =3188646a(12) =9565938a(13) =28697814a(14) =86093442a(15) =258280326a(16) =774840978a(17) =2324522934a(18) =6973568802a(19) =20920706406a(20) =62762119218a(21) =188286357654a(22) =564859072962
External references
- oeis: A206143