Half the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having exactly two distinct clockwise edge differences.
A209530
Half the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having exactly two distinct clockwise edge differences.
Terms
- a(0) =9a(1) =25a(2) =65a(3) =193a(4) =513a(5) =1537a(6) =4097a(7) =12289a(8) =32769a(9) =98305a(10) =262145a(11) =786433a(12) =2097153a(13) =6291457a(14) =16777217a(15) =50331649a(16) =134217729a(17) =402653185a(18) =1073741825a(19) =3221225473a(20) =8589934593a(21) =25769803777a(22) =68719476737a(23) =206158430209a(24) =549755813889
External references
- oeis: A209530