a(n) = a(n-1) + a(n-2) + a([n/2]) + a([n/3]) + ... + a([n/n]), where a(0) = 1, a(1) = 1, a(2) = 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =8a(5) =16a(6) =32a(7) =57a(8) =103a(9) =178a(10) =308a(11) =514a(12) =874a(13) =1441a(14) =2394a(15) =3926a(16) =6462a(17) =10531a(18) =17231a(19) =28001a(20) =45614a(21) =74026a(22) =120258a(23) =194903a(24) =316210a(25) =512171a(26) =830007a(27) =1343883a(28) =2176578a(29) =3523150