Number of colors that can be mixed with up to n units of yellow, blue, red.

Terms

a(0) =0a(1) =3a(2) =6a(3) =13a(4) =22a(5) =40a(6) =55a(7) =88a(8) =118a(9) =163a(10) =205a(11) =280a(12) =334a(13) =436a(14) =517a(15) =625a(16) =733a(17) =901a(18) =1018a(19) =1225a(20) =1381a(21) =1591a(22) =1786a(23) =2083a(24) =2287a(25) =2617a(26) =2887a(27) =3238a(28) =3544a(29) =4006