Alternately append n to end or beginning of previous term.

A053064

Alternately append n to end or beginning of previous term.

Terms

    a(0) =1a(1) =12a(2) =312a(3) =3124a(4) =53124a(5) =531246a(6) =7531246a(7) =75312468a(8) =975312468a(9) =97531246810

External references