Number of (n+1)X8 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A186480

Number of (n+1)X8 0..3 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =20079a(1) =14492a(2) =82632a(3) =101305a(4) =433513a(5) =418177a(6) =1849873a(7) =1894849a(8) =7687009a(9) =8602033a(10) =31645329a(11) =39574001a(12) =131802797a(13) =181420169a(14) =553069145a(15) =820669641a(16) =2331052105a(17) =3678141757a(18) =9868524241a(19) =16371829777a(20) =41936161201a(21) =72480530737a(22) =178779125389

External references