Number of 2 X n 0..3 arrays with no more than floor(2 X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
A222907
Number of 2 X n 0..3 arrays with no more than floor(2 X n/2) elements unequal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.
Terms
- a(0) =2a(1) =4a(2) =7a(3) =25a(4) =92a(5) =403a(6) =1710a(7) =8021a(8) =36160a(9) =175685a(10) =811796a(11) =3996105a(12) =18729552a(13) =92602363a(14) =438528764a(15) =2169839823a(16) =10361611742a(17) =51246105785a(18) =246397237188
External references
- oeis: A222907