T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

A186923

T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with every 2X2 subblock trace equal to exactly one or two horizontal and vertical neighbor 2X2 subblock traces.

Terms

    a(0) =0a(1) =704a(2) =704a(3) =2176a(4) =13440a(5) =2176a(6) =30976a(7) =253312a(8) =253312a(9) =30976a(10) =166272a(11) =4615296a(12) =7946432a(13) =4615296a(14) =166272a(15) =1567936a(16) =86388160a(17) =394724320a(18) =394724320a(19) =86388160a(20) =1567936a(21) =10419200a(22) =1613838400a(23) =15491352288a(24) =39825200832a(25) =15491352288

External references