s(k)=1, where s=A030737.

Terms

a(0) =2a(1) =3a(2) =9a(3) =10a(4) =15a(5) =21a(6) =22a(7) =30a(8) =31a(9) =41a(10) =42a(11) =54a(12) =55a(13) =69a(14) =70a(15) =81a(16) =87a(17) =88a(18) =107a(19) =108a(20) =129a(21) =130a(22) =153a(23) =177a(24) =193a(25) =196a(26) =199a(27) =202a(28) =205a(29) =207