a(n) is the concatenation of the first n positive even numbers.

A019520

a(n) is the concatenation of the first n positive even numbers.

Terms

    a(0) =2a(1) =24a(2) =246a(3) =2468a(4) =246810a(5) =24681012a(6) =2468101214a(7) =246810121416

External references