a(n) = a(n-1) + rotate(a(n-1), n-2 digits left) with a(1) = 1.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =55a(7) =110a(8) =211a(9) =332a(10) =664a(11) =1310a(12) =1441a(13) =2882a(14) =11704a(15) =52874a(16) =105748a(17) =586805a(18) =1145485a(19) =5996630a(20) =9056596a(21) =15962255a(22) =41478217a(23) =58892999a(24) =154782298a(25) =452937080a(26) =1257466450a(27) =7707592196a(28) =9675299788a(29) =18572052785