Number of (n+1)X9 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

A186471

Number of (n+1)X9 0..2 arrays with every 2X2 subblock commuting with each of its horizontal and vertical 2X2 subblock neighbors.

Terms

    a(0) =4553a(1) =5790a(2) =13985a(3) =31866a(4) =52755a(5) =109950a(6) =170811a(7) =399018a(8) =570183a(9) =1266414a(10) =1812423a(11) =3993474a(12) =6107001a(13) =13004678a(14) =20863681a(15) =42650908a(16) =70588930a(17) =140178754a(18) =237788174a(19) =462275652a(20) =798678366a(21) =1528016844a(22) =2676404634a(23) =5059638908a(24) =8953777234

External references