a(0) = 0; for n>0, a(n) = A005598(n)/2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =7a(5) =12a(6) =18a(7) =27a(8) =38a(9) =52a(10) =68a(11) =89a(12) =112a(13) =141a(14) =173a(15) =209a(16) =249a(17) =297a(18) =348a(19) =408a(20) =472a(21) =542a(22) =617a(23) =703a(24) =793a(25) =893a(26) =999a(27) =1114a(28) =1235a(29) =1370