1/4 the number of (n+1)X4 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.
A209548
1/4 the number of (n+1)X4 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences.
Terms
- a(0) =61a(1) =562a(2) =5075a(3) =46515a(4) =425803a(5) =3901194a(6) =35741496a(7) =327471411a(8) =3000373035a(9) =27490276714a(10) =251873944521
External references
- oeis: A209548