1/4 the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having distinct clockwise edge differences.
A209721
1/4 the number of (n+1) X 3 0..2 arrays with every 2 X 2 subblock having distinct clockwise edge differences.
Terms
- a(0) =3a(1) =4a(2) =5a(3) =7a(4) =9a(5) =13a(6) =17a(7) =25a(8) =33a(9) =49a(10) =65a(11) =97a(12) =129a(13) =193a(14) =257a(15) =385a(16) =513a(17) =769a(18) =1025a(19) =1537a(20) =2049a(21) =3073a(22) =4097a(23) =6145a(24) =8193a(25) =12289a(26) =16385a(27) =24577a(28) =32769a(29) =49153
External references
- oeis: A209721