Duplicate of A083829.

Terms

a(0) =1a(1) =2a(2) =7a(3) =77a(4) =141a(5) =151a(6) =161a(7) =242a(8) =252a(9) =262a(10) =777a(11) =7777a(12) =14041a(13) =14141a(14) =14241a(15) =15051