T(n,k)=1/6 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing two of one value, three of another, and four of the last.

A184407

T(n,k)=1/6 the number of (n+2)X(k+2) 0..2 arrays with each 3X3 subblock containing two of one value, three of another, and four of the last.

Terms

    a(0) =1260a(1) =16140a(2) =16140a(3) =201543a(4) =326100a(5) =201543a(6) =2563542a(7) =6361037a(8) =6361037a(9) =2563542a(10) =32546547a(11) =127484430a(12) =190904616a(13) =127484430a(14) =32546547a(15) =414199395a(16) =2555137939a(17) =5944363862a(18) =5944363862a(19) =2555137939a(20) =414199395a(21) =5273355420a(22) =51389641795

External references