1/4 the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having one or four distinct clockwise edge differences.
A209851
1/4 the number of (n+1) X 2 0..3 arrays with every 2 X 2 subblock having one or four distinct clockwise edge differences.
Terms
- a(0) =25a(1) =182a(2) =1308a(3) =9455a(4) =68201a(5) =492373a(6) =3553425a(7) =25648639a(8) =185120173a(9) =1336151135a(10) =9643879893a(11) =69606629219a(12) =502398343961
External references
- oeis: A209851