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%I #17 Mar 09 2018 06:06:18
%S 1,10101,11111110101,10010010010011111110101,
%T 10110110110110110010010010011111110101,
%U 11011011011011011010110110110110110010010010011111110101,11111111111111111111111011011011011011010110110110110110010010010011111110101
%N a(n) is the concatenation n written in base 2 n times, n-1 written in base 2 n-1 times, ..., 1 written in base 2 once.
%H Seiichi Manyama, <a href="/A300558/b300558.txt">Table of n, a(n) for n = 1..21</a>
%o (Ruby)
%o def A300558(n)
%o a = '1'
%o [1] + (2..n).map{|i| a = (i.to_s(2) * i + a.to_s).to_i}
%o end
%o p A300558(10)
%Y Cf. A007088, A300517, A300557.
%K nonn,base
%O 1,2
%A _Seiichi Manyama_, Mar 08 2018
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