A300557 a(n) is the concatenation 1 written in base 2 once, 2 written in base 2 twice, ..., n written in base 2 n times.

1, 11010, 11010111111, 11010111111100100100100, 11010111111100100100100101101101101101, 11010111111100100100100101101101101101110110110110110110, 11010111111100100100100101101101101101110110110110110110111111111111111111111

Offset: 1

Author

Seiichi Manyama, Mar 08 2018

Keywords

• nonn

Links

• Seiichi Manyama, Table of n, a(n) for n = 1..21

Crossrefs

Cf. A007088, A098129, A300558.