a(1) = 0, a(2) = 1, a(n) = concatenate(a(n-1) and a(n-2)) - a(n-1).

A068109

a(1) = 0, a(2) = 1, a(n) = concatenate(a(n-1) and a(n-2)) - a(n-1).

Terms

    a(0) =0a(1) =1a(2) =9a(3) =82a(4) =747a(5) =74035a(6) =73961712

External references