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

1,2

Links

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

Crossrefs

Cf. A007088, A098129, A300558.

Sequence in context: A251873 A267038 A267293 * A181319 A267811 A267934

Adjacent sequences: A300554 A300555 A300556 * A300558 A300559 A300560

Keyword

nonn

Author

Seiichi Manyama, Mar 08 2018

Status

approved