T(n,k)=1/8192 the number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A186553

T(n,k)=1/8192 the number of (n+2)X(k+2) 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =0a(1) =290a(2) =290a(3) =2972a(4) =19016a(5) =2972a(6) =168200a(7) =1279862a(8) =1279862a(9) =168200a(10) =3090668a(11) =88662978a(12) =177942264a(13) =88662978a(14) =3090668a(15) =111188198a(16) =6215002266a(17) =31976088817a(18) =31976088817a(19) =6215002266a(20) =111188198a(21) =2585394080a(22) =435599518160

External references