T(n,k)=1/24 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock containing exactly three distinct values.

A183594

T(n,k)=1/24 the number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock containing exactly three distinct values.

Terms

    a(0) =6a(1) =56a(2) =56a(3) =520a(4) =1243a(5) =520a(6) =4832a(7) =27380a(8) =27380a(9) =4832a(10) =44896a(11) =603766a(12) =1427084a(13) =603766a(14) =44896a(15) =417152a(16) =13311808a(17) =74491726a(18) =74491726a(19) =13311808a(20) =417152a(21) =3875968a(22) =293504588a(23) =3887550226a(24) =9207834547a(25) =3887550226a(26) =293504588a(27) =3875968a(28) =36013568

External references