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

A187140

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

Terms

    a(0) =0a(1) =171a(2) =171a(3) =405a(4) =1773a(5) =405a(6) =3249a(7) =19062a(8) =19062a(9) =3249a(10) =12609a(11) =182214a(12) =267840a(13) =182214a(14) =12609a(15) =72225a(16) =1853892a(17) =5755698a(18) =5755698a(19) =1853892a(20) =72225a(21) =332937a(22) =18740754a(23) =99203418a(24) =201302208a(25) =99203418a(26) =18740754a(27) =332937a(28) =1731321a(29) =189091422

External references