Incomplete version of A000053.

Terms

a(0) =14a(1) =23a(2) =28a(3) =34a(4) =42a(5) =50a(6) =59a(7) =66a(8) =72a(9) =79a(10) =86a(11) =96a(12) =103a(13) =110a(14) =116a(15) =125a(16) =137a(17) =145a(18) =157a(19) =168a(20) =181a(21) =191a(22) =207a(23) =215a(24) =225a(25) =231a(26) =238a(27) =242