a(2n-1) is concatenation of sequence (1,3,..,2n-3,2n-1,2n-3,..3,1) and a(2n) is concatenation of sequence (1,3,..,2n-3,2n-1,2n-1,2n-3,..3,1).

A287295

a(2n-1) is concatenation of sequence (1,3,..,2n-3,2n-1,2n-3,..3,1) and a(2n) is concatenation of sequence (1,3,..,2n-3,2n-1,2n-1,2n-3,..3,1).

Terms

    a(0) =1a(1) =11a(2) =131a(3) =1331a(4) =13531a(5) =135531a(6) =1357531a(7) =13577531a(8) =135797531a(9) =1357997531a(10) =135791197531

External references