300764domain: NAppears in sequencesa(n) = sigma_3(2*n+1).at n=33A045823a(n) = sigma_3(3n+1).at n=22A092342Expansion of Product_{k>=1} 1/(1 - 2*x^(k^2)).at n=18A291583a(n) is the number of sets of noncongruent five-cuboid combinations that fill an n X n X n cube excluding combinations that contain cube-shaped cuboids.at n=20A386757