T(n,m)=Number of (n+1)X3 0..m arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A190023

T(n,m)=Number of (n+1)X3 0..m arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =21a(1) =83a(2) =30a(3) =205a(4) =129a(5) =51a(6) =419a(7) =362a(8) =243a(9) =88a(10) =713a(11) =839a(12) =701a(13) =562a(14) =128a(15) =1169a(16) =1638a(17) =1715a(18) =2049a(19) =903a(20) =197a(21) =1709a(22) =2923a(23) =3343a(24) =5879a(25) =3442a(26) =1754a(27) =292a(28) =2471a(29) =4834

External references