T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

A206343

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock having nonzero determinant and commuting with every horizontal or vertical neighbor.

Terms

    a(0) =192a(1) =96a(2) =96a(3) =455a(4) =181a(5) =455a(6) =296a(7) =232a(8) =232a(9) =296a(10) =1376a(11) =534a(12) =1340a(13) =534a(14) =1376a(15) =880a(16) =686a(17) =682a(18) =682a(19) =686a(20) =880a(21) =4111a(22) =1589a(23) =4007a(24) =1581a(25) =4007a(26) =1589a(27) =4111a(28) =2622a(29) =2042

External references