a(1)=a(2)=a(3)=1. a(n) = reverseDigits(a(n-1)+a(n-2)+a(n-3)) for n>=4.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =9a(6) =71a(7) =58a(8) =831a(9) =69a(10) =859a(11) =9571a(12) =99401a(13) =138901a(14) =378742a(15) =440716a(16) =953859a(17) =7133771a(18) =6438258a(19) =88852541a(20) =75424201a(21) =517071a(22) =318397461a(23) =337833493a(24) =520847656a(25) =168707711a(26) =688837201a(27) =8652938731a(28) =3463840159a(29) =19061650821