11907000domain: NAppears in sequencesa(n) = polygorial(n,3)/polygorial(3,n), n >= 3.at n=6A085356Coefficients in q-expansion of (E_2^3*E_4 - 3*E_2^2*E_6 + 3*E_2*E_4^2 - E_4*E_6)/3456, where E_2, E_4, E_6 are the Eisenstein series shown in A006352, A004009, A013973, respectively.at n=15A282213