a(n) is half the number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having at most one duplicate clockwise edge difference.
A209944
a(n) is half the number of (n+1) X 2 0..2 arrays with every 2 X 2 subblock having at most one duplicate clockwise edge difference.
Terms
- a(0) =34a(1) =258a(2) =1956a(3) =14832a(4) =112464a(5) =852768a(6) =6466176a(7) =49030272a(8) =371775744a(9) =2819017728a(10) =21375415296a(11) =162080704512
External references
- oeis: A209944