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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.
3
1, 11010, 11010111111, 11010111111100100100100, 11010111111100100100100101101101101101, 11010111111100100100100101101101101101110110110110110110, 11010111111100100100100101101101101101110110110110110110111111111111111111111
OFFSET
1,2
LINKS
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Mar 08 2018
STATUS
approved