Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.
A186469
Number of (n+1) X 7 0..2 arrays with every 2 X 2 subblock commuting with each of its horizontal and vertical 2 X 2 subblock neighbors.
Terms
- a(0) =1321a(1) =1754a(2) =4023a(3) =9834a(4) =16083a(5) =34314a(6) =49407a(7) =109950a(8) =159879a(9) =350418a(10) =540777a(11) =1143302a(12) =1845649a(13) =3753244a(14) =6241282a(15) =12344866a(16) =21014030a(17) =40729476a(18) =70552158a(19) =134674572a(20) =236349786a(21) =446055356a(22) =790511890a(23) =1479273964a(24) =2640888394
External references
- oeis: A186469