Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock trace equal to some horizontal or vertical neighbor 2 X 2 subblock trace.

A185837

Number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock trace equal to some horizontal or vertical neighbor 2 X 2 subblock trace.

Terms

    a(0) =0a(1) =171a(2) =405a(3) =3249a(4) =12609a(5) =72225a(6) =332937a(7) =1731321a(8) =8410473a(9) =42400017a(10) =209335185a(11) =1045669905a(12) =5189897529a(13) =25851542121a(14) =128510546841a(15) =639547289793

External references