Number of (n+2)X9 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

A186879

Number of (n+2)X9 0..3 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

Terms

    a(0) =277659a(1) =21661a(2) =37576a(3) =121144a(4) =260584a(5) =338176a(6) =443560a(7) =571984a(8) =798832a(9) =1272712a(10) =2086288a(11) =3350152a(12) =5585728a(13) =9225664a(14) =15403771a(15) =25918654a(16) =43087345a(17) =71662141a(18) =119953993a(19) =199127077a(20) =331052797a(21) =553674334a(22) =920445640a(23) =1531199242a(24) =2558915851

External references