Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal neighbor and the top left element equal to 0.
A267727
Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one horizontal neighbor and the top left element equal to 0.
Terms
- a(0) =0a(1) =6a(2) =6a(3) =630a(4) =1398a(5) =93672a(6) =609264a(7) =20702760a(8) =279681294a(9) =7420195854a(10) =149049265998
External references
- oeis: A267727