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

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =77a(6) =154a(7) =695a(8) =1264a(9) =3905a(10) =4444a(11) =8888a(12) =17776a(13) =93953a(14) =133348a(15) =481481a(16) =1296295a(17) =7591424a(18) =11839015a(19) =50854133a(20) =92189218a(21) =114081407a(22) =928152547a(23) =1182945362a(24) =10636566544a(25) =47203110650a(26) =78309615370a(27) =139846693679a(28) =606783485077a(29) =955291245755