s(k)=1, where s=A030727.

Terms

a(0) =2a(1) =3a(2) =6a(3) =14a(4) =15a(5) =19a(6) =22a(7) =30a(8) =31a(9) =41a(10) =42a(11) =53a(12) =55a(13) =68a(14) =70a(15) =85a(16) =87a(17) =103a(18) =106a(19) =126a(20) =148a(21) =167a(22) =172a(23) =193a(24) =194a(25) =199a(26) =213a(27) =229a(28) =254a(29) =257