MacMahon's solid partitions of n in which 3 is the smallest summand.

Terms

a(0) =6a(1) =0a(2) =0a(3) =21a(4) =60a(5) =90a(6) =182a(7) =378a(8) =861a(9) =1737a(10) =3458a(11) =6717a(12) =13377a(13) =25877a(14) =49949a(15) =95085a(16) =180254a(17) =338003a(18) =631124a(19) =1168226a(20) =2151409a(21) =3934674a(22) =7159108a(23) =12948649a(24) =23307439a(25) =41730764a(26) =74374385a(27) =131927754a(28) =233011531a(29) =409767123