Number of (n+3) X 4 0..2 arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.
A186581
Number of (n+3) X 4 0..2 arrays with every 4 X 4 subblock commuting with each horizontal and vertical neighbor 4 X 4 subblock.
Terms
- a(0) =43046721a(1) =8824a(2) =38608a(3) =192026a(4) =805791a(5) =1728546a(6) =2296065a(7) =2604716a(8) =2927679a(9) =3089510a(10) =3313917a(11) =4090548a(12) =6218902a(13) =9961241a(14) =15014753a(15) =21788652a(16) =31911831a(17) =45586648a(18) =62332637a(19) =84072672a(20) =116767981a(21) =164051247a(22) =227583882a(23) =314652408
External references
- oeis: A186581