Number of partitions of n in which some but not all parts are equal.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =3a(6) =4a(7) =9a(8) =13a(9) =20a(10) =29a(11) =43a(12) =57a(13) =82a(14) =110a(15) =146a(16) =195a(17) =258a(18) =334a(19) =435a(20) =558a(21) =713a(22) =910a(23) =1150a(24) =1446a(25) =1814a(26) =2268a(27) =2815a(28) =3491a(29) =4308