Subdiagonal partitions: number of partitions (p1, p2, p3, ...) of n with pi <= i.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =4a(6) =5a(7) =7a(8) =10a(9) =15a(10) =18a(11) =26a(12) =35a(13) =47a(14) =61a(15) =80a(16) =103a(17) =138a(18) =175a(19) =224a(20) =283a(21) =362a(22) =455a(23) =577a(24) =721a(25) =898a(26) =1111a(27) =1380a(28) =1701a(29) =2106