'Reverse and Add!' trajectory of 1997.

Terms

a(0) =1997a(1) =9988a(2) =18887a(3) =97768a(4) =184547a(5) =930028a(6) =1750067a(7) =9350638a(8) =17711177a(9) =94822948a(10) =179745797a(11) =977293768a(12) =1844686547a(13) =9301551028a(14) =17503102067a(15) =93523232638a(16) =177146465177a(17) =948711106948