a(n) = a(n-1) + rotate( a(n-1), 1 digit left), a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =77a(6) =154a(7) =695a(8) =1651a(9) =8162a(10) =9790a(11) =17699a(12) =94690a(13) =141599a(14) =557590a(15) =1133495a(16) =2468446a(17) =7152908a(18) =8681995a(19) =15501953a(20) =70521484a(21) =75736331a(22) =133099648a(23) =464096129a(24) =1105057423a(25) =2155631654a(26) =3711948196a(27) =10831430159a(28) =19145731750a(29) =110603049251