a(n) = a(n-1) + rotate(a(n-1), n-1 digits right) with a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =77a(6) =154a(7) =569a(8) =1264a(9) =5390a(10) =14443a(11) =45887a(12) =133345a(13) =646679a(14) =1443145a(15) =6587459a(16) =12553333a(17) =43808666a(18) =110246752a(19) =321271427a(20) =594484141a(21) =736078625a(22) =1598652232a(23) =3920250884a(24) =4804642909a(25) =9095590955a(26) =15005150050a(27) =65055300101a(28) =95065465156a(29) =149717034662