Number of (n+2)X3 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

A186873

Number of (n+2)X3 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

Terms

    a(0) =262144a(1) =2428a(2) =19236a(3) =46583a(4) =104701a(5) =186096a(6) =277659a(7) =322910a(8) =569446a(9) =975469a(10) =1428461a(11) =2729288a(12) =4782807a(13) =7112898a(14) =12726103a(15) =21815463a(16) =33093523a(17) =58123410a(18) =99742321a(19) =154917607a(20) =268187989a(21) =458493523a(22) =723302362a(23) =1237486150a(24) =2107632127

External references