a(1) = 11. a(n) is obtained by filling the space between neighboring digits in a(n-1) with their sum.

A110398

a(1) = 11. a(n) is obtained by filling the space between neighboring digits in a(n-1) with their sum.

Terms

    a(0) =11a(1) =121a(2) =13231a(3) =143525341

External references