a(n) = ceiling(A000931(n)/2).

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =2a(8) =3a(9) =4a(10) =5a(11) =6a(12) =8a(13) =11a(14) =14a(15) =19a(16) =25a(17) =33a(18) =43a(19) =57a(20) =76a(21) =100a(22) =133a(23) =176a(24) =233a(25) =308a(26) =408a(27) =541a(28) =716a(29) =949