Engel expansion of the Dottie number, A003957.

Terms

a(0) =2a(1) =3a(2) =3a(3) =4a(4) =5a(5) =15a(6) =17a(7) =66a(8) =196a(9) =233a(10) =284a(11) =375a(12) =1613a(13) =2131a(14) =3574a(15) =14122a(16) =24171a(17) =49097a(18) =56871a(19) =69361a(20) =193406a(21) =243145a(22) =289951a(23) =682749a(24) =14501588a(25) =21191773a(26) =121635191a(27) =810759781a(28) =1292785381a(29) =136110231377