a(n) = ceiling(A173510(n)/2).

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =3a(5) =3a(6) =4a(7) =5a(8) =7a(9) =9a(10) =11a(11) =14a(12) =18a(13) =23a(14) =30a(15) =38a(16) =49a(17) =63a(18) =80a(19) =103a(20) =132a(21) =169a(22) =216a(23) =277a(24) =355a(25) =454a(26) =582a(27) =745a(28) =954a(29) =1222