Number of integer partitions of n with 2 distinct parts or at least 3 parts.

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =3a(5) =6a(6) =9a(7) =14a(8) =20a(9) =29a(10) =40a(11) =55a(12) =75a(13) =100a(14) =133a(15) =175a(16) =229a(17) =296a(18) =383a(19) =489a(20) =625a(21) =791a(22) =1000a(23) =1254a(24) =1573a(25) =1957a(26) =2434a(27) =3009a(28) =3716a(29) =4564