s(n)=3, where s=A030727.

Terms

a(0) =1a(1) =5a(2) =7a(3) =21a(4) =50a(5) =51a(6) =52a(7) =142a(8) =166a(9) =219a(10) =243a(11) =252a(12) =255a(13) =261a(14) =299a(15) =327a(16) =330a(17) =331a(18) =337a(19) =340a(20) =374a(21) =376a(22) =381a(23) =384a(24) =427a(25) =430a(26) =476a(27) =479a(28) =524a(29) =528