Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

A207043

Number of (n+1) X 2 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly one clockwise edge increases.

Terms

    a(0) =81a(1) =150a(2) =441a(3) =1416a(4) =4371a(5) =13386a(6) =41589a(7) =128700a(8) =397335a(9) =1229310a(10) =3802377a(11) =11755344a(12) =36352875a(13) =112421490a(14) =347633853a(15) =1075001508a(16) =3324303039a(17) =10279835430a(18) =31788718257a(19) =98301693240a(20) =303982182099a(21) =940016132634

External references