a(n) = denominator of 1/(1 + 1/(1 + 2/(1 + ... (1 + n)))).

Terms

a(0) =2a(1) =4a(2) =5a(3) =13a(4) =19a(5) =58a(6) =191a(7) =131a(8) =1187a(9) =2231a(10) =17519a(11) =71063a(12) =29881a(13) =323423a(14) =2887921a(15) =13237457a(16) =2397389a(17) =15030317a(18) =742458253a(19) =3748521653a(20) =9670072483a(21) =25451905333a(22) =10932619111a(23) =78684575461