MacMahon's solid partitions of n in which 2 is the smallest summand.

Terms

a(0) =3a(1) =0a(2) =6a(3) =18a(4) =40a(5) =81a(6) =201a(7) =414a(8) =916a(9) =1899a(10) =3973a(11) =8059a(12) =16402a(13) =32561a(14) =64520a(15) =125986a(16) =244448a(17) =469195a(18) =895077a(19) =1692143a(20) =3179406a(21) =5929721a(22) =10993373a(23) =20250589a(24) =37096872a(25) =67568512a(26) =122437970a(27) =220721343a(28) =395998810a(29) =707122884