Mixed Van der Waerden numbers w(n, 3; 2).

Terms

a(0) =3a(1) =6a(2) =9a(3) =18a(4) =22a(5) =32a(6) =46a(7) =58a(8) =77a(9) =97a(10) =114a(11) =135a(12) =160a(13) =186a(14) =218a(15) =238a(16) =279a(17) =312a(18) =349