128240domain: NAppears in sequencesa(n) = n^3 + (n+2)^3.at n=39A153976Number of 0..3 arrays of length n with each element differing from at least one neighbor by 2 or more, starting with 0.at n=12A221510a(n) = 4*n*(4*n^2 + 3).at n=20A271636a(n) = 256n^2 - 828n + 656 (n>=1).at n=23A304379