Length of A001388(n).

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =6a(5) =7a(6) =10a(7) =12a(8) =18a(9) =25a(10) =31a(11) =41a(12) =56a(13) =73a(14) =96a(15) =128a(16) =171a(17) =226a(18) =302a(19) =399a(20) =533a(21) =704a(22) =937a(23) =1236a(24) =1645a(25) =2170a(26) =2884a(27) =3806a(28) =5059a(29) =6680