a(1)=1, a(n+1) = 10*a(n)+2*n-1.

A179619

a(1)=1, a(n+1) = 10*a(n)+2*n-1.

Terms

    a(0) =1a(1) =13a(2) =135a(3) =1357a(4) =13579a(5) =135801a(6) =1358023a(7) =13580245a(8) =135802467a(9) =1358024689a(10) =13580246911a(11) =135802469133

External references