a(n) = a([ .5 + n/2 ]) + a([ .5 + n/3 ]) + ... + a([ .5 + n/n ]).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =6a(6) =8a(7) =10a(8) =13a(9) =15a(10) =18a(11) =19a(12) =23a(13) =27a(14) =31a(15) =32a(16) =37a(17) =42a(18) =45a(19) =49a(20) =54a(21) =56a(22) =63a(23) =64a(24) =71a(25) =77a(26) =84a(27) =88a(28) =95a(29) =99