Number of cubic equations ax^3 + bx^2 + cx + d = 0 with integer coefficients |a|,|b|,|c|,|d| <= n, a <> 0, having three distinct real roots.

A155191

Number of cubic equations ax^3 + bx^2 + cx + d = 0 with integer coefficients |a|,|b|,|c|,|d| <= n, a <> 0, having three distinct real roots.

Terms

    a(0) =0a(1) =6a(2) =84a(3) =374a(4) =1108a(5) =2606a(6) =5264a(7) =9522a(8) =15972a(9) =25242a(10) =38132a(11) =55322a(12) =77816a(13) =106510a(14) =142588a(15) =187078a(16) =241228a(17) =306318a(18) =383912a(19) =475266a(20) =582100a(21) =706010a(22) =848788a(23) =1012050a(24) =1197920a(25) =1408190a(26) =1645268a(27) =1910854a(28) =2207436a(29) =2537118

External references