Number of solutions to a^2 + b^2 + 3*c^2 + 3*d^2 = n.

Terms

a(0) =1a(1) =4a(2) =4a(3) =4a(4) =20a(5) =24a(6) =4a(7) =32a(8) =52a(9) =4a(10) =24a(11) =48a(12) =20a(13) =56a(14) =32a(15) =24a(16) =116a(17) =72a(18) =4a(19) =80a(20) =120a(21) =32a(22) =48a(23) =96a(24) =52a(25) =124a(26) =56a(27) =4a(28) =160a(29) =120