Number of 4's in all the partitions of n into distinct parts.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =2a(7) =1a(8) =2a(9) =3a(10) =3a(11) =5a(12) =6a(13) =7a(14) =9a(15) =10a(16) =12a(17) =15a(18) =18a(19) =22a(20) =26a(21) =31a(22) =36a(23) =42a(24) =50a(25) =58a(26) =68a(27) =80a(28) =92a(29) =107