CONTINUANT transform of 0, 1, 1, 2, 1, 3, 2, 3, ... (A002487).

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =4a(5) =15a(6) =34a(7) =117a(8) =151a(9) =721a(10) =2314a(11) =12291a(12) =26896a(13) =146771a(14) =467209a(15) =2015607a(16) =2482816a(17) =14429687a(18) =60201564a(19) =435840635a(20) =1367723469a(21) =11377628387a(22) =58255865404a(23) =419168686215a(24) =896593237834