Number of integer partitions of n whose first differences are not all distinct.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =2a(6) =6a(7) =7a(8) =11a(9) =18a(10) =26a(11) =34a(12) =56a(13) =71a(14) =101a(15) =134a(16) =182a(17) =233a(18) =318a(19) =403a(20) =532a(21) =675a(22) =870a(23) =1095a(24) =1406a(25) =1751a(26) =2206a(27) =2736a(28) =3417a(29) =4205