1/729 the number of (n+2)X3 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.
A186954
1/729 the number of (n+2)X3 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.
Terms
- a(0) =0a(1) =141a(2) =831a(3) =19881a(4) =201495a(5) =3281361a(6) =40300479a(7) =582004185a(8) =7640173839a(9) =105998979105
External references
- oeis: A186954