T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

A185845

T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every 2X2 subblock trace equal to some horizontal or vertical neighbor 2X2 subblock trace.

Terms

    a(0) =0a(1) =171a(2) =171a(3) =405a(4) =1773a(5) =405a(6) =3249a(7) =20097a(8) =20097a(9) =3249a(10) =12609a(11) =222003a(12) =424197a(13) =222003a(14) =12609a(15) =72225a(16) =2506851a(17) =10670517a(18) =10670517a(19) =2506851a(20) =72225a(21) =332937a(22) =28276065a(23) =254648349a(24) =560733777a(25) =254648349a(26) =28276065a(27) =332937a(28) =1731321a(29) =319126401

External references