Half the number of (n+1)X6 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
A209508
Half the number of (n+1)X6 0..2 arrays with every 2X2 subblock having two or four distinct clockwise edge differences.
Terms
- a(0) =729a(1) =11673a(2) =189801a(3) =3102219a(4) =50798448a(5) =832374135a(6) =13642432110a(7) =223616134827
External references
- oeis: A209508