s(n) = 2, where s = A030787.

Terms

a(0) =3a(1) =9a(2) =10a(3) =17a(4) =64a(5) =67a(6) =79a(7) =96a(8) =98a(9) =115a(10) =135a(11) =157a(12) =161a(13) =162a(14) =183a(15) =193a(16) =212a(17) =216a(18) =243a(19) =276a(20) =280a(21) =281a(22) =312a(23) =350a(24) =355a(25) =390a(26) =393a(27) =396a(28) =400a(29) =434