Number of (n+3)X(n+3) 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock.

A186580

Number of (n+3)X(n+3) 0..2 arrays with every 4X4 subblock commuting with each horizontal and vertical neighbor 4X4 subblock.

Terms

    a(0) =43046721a(1) =827a(2) =5879a(3) =163723a(4) =569947a(5) =811795a(6) =855715a(7) =1049539a(8) =1464331a(9) =2211763a(10) =3510715a(11) =6188179a(12) =16060459a(13) =36931171a(14) =74101531a(15) =139265491a(16) =305505067a(17) =600286819a(18) =1098007483

External references