T(n,k)=1/729 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A186962

T(n,k)=1/729 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =0a(1) =141a(2) =141a(3) =831a(4) =3783a(5) =831a(6) =19881a(7) =112707a(8) =112707a(9) =19881a(10) =201495a(11) =3277141a(12) =5903759a(13) =3277141a(14) =201495a(15) =3281361a(16) =97400287a(17) =373049827a(18) =373049827a(19) =97400287a(20) =3281361a(21) =40300479a(22) =2888274935a(23) =22237406277a(24) =47796308777a(25) =22237406277a(26) =2888274935

External references