232200domain: NAppears in sequencesa(n) = Sum_{k <= n/2 } k*binomial(n-2k, 3k).at n=24A137359Coefficients in q-expansion of (E_2^3 - E_2*E_4)/288, where E_2 and E_4 are the Eisenstein series shown in A006352 and A004009, respectively.at n=15A282020