Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.
A186474
Number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.
Terms
- a(0) =256a(1) =205a(2) =1098a(3) =1251a(4) =4895a(5) =5955a(6) =20079a(7) =27101a(8) =84228a(9) =123227a(10) =354915a(11) =553287a(12) =1501107a(13) =2465976a(14) =6374253a(15) =10928793a(16) =27157017a(17) =48218637a(18) =116026140a(19) =211997451a(20) =496891083a(21) =929460999a(22) =2132220387a(23) =4065922560a(24) =9164874045a(25) =17754363633
External references
- oeis: A186474