391650domain: NAppears in sequencesNumber of length 6 walks on an n-dimensional hypercubic lattice starting and finishing at the origin and staying in the nonnegative part.at n=30A064046G.f. satisfies A(x) = 1 + x*(1 + x*A(x)^6)^5.at n=7A137973Half the number of 0..n arrays of length 4 with second differences nonzero.at n=28A212783