A051851(n)/row_index_of(n).

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =2a(5) =7a(6) =1a(7) =2a(8) =3a(9) =8a(10) =39a(11) =1a(12) =2a(13) =3a(14) =9a(15) =10a(16) =52a(17) =311a(18) =1a(19) =2a(20) =3a(21) =4a(22) =10a(23) =11a(24) =19a(25) =67a(26) =68a(27) =467a(28) =3268a(29) =1