90966domain: NAppears in sequencesTrails of length n on cubic lattice.at n=7A006819Expansion of (1+3*x+9*x^2+12*x^3+11*x^4+3*x^5+x^6)/((1-x)^2*(1-x^2)^2*(1-x^3)).at n=27A055383Number of Sidon subsets of {1,...,n} of size 4.at n=41A241688