s(k)=1, where s=A030747.

Terms

a(0) =2a(1) =3a(2) =6a(3) =16a(4) =29a(5) =30a(6) =39a(7) =49a(8) =50a(9) =62a(10) =75a(11) =77a(12) =92a(13) =94a(14) =113a(15) =133a(16) =152a(17) =155a(18) =173a(19) =178a(20) =181a(21) =204a(22) =207a(23) =210a(24) =238a(25) =241a(26) =271a(27) =274a(28) =307a(29) =310