Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
A222271
Number of nX3 0..3 arrays with exactly floor(nX3/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =0a(1) =4a(2) =4a(3) =81a(4) =364a(5) =5996a(6) =27980a(7) =507909a(8) =2380692a(9) =44501178a(10) =208717216a(11) =3948025953a(12) =18510211252a(13) =352744650956
External references
- oeis: A222271