s(k)=1, where s=A030777.

Terms

a(0) =2a(1) =4a(2) =6a(3) =11a(4) =12a(5) =16a(6) =19a(7) =23a(8) =24a(9) =32a(10) =33a(11) =43a(12) =45a(13) =56a(14) =58a(15) =71a(16) =73a(17) =88a(18) =91a(19) =107a(20) =127a(21) =149a(22) =154a(23) =173a(24) =178a(25) =179a(26) =200a(27) =216a(28) =230a(29) =232