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%I #18 Feb 26 2023 10:58:08
%S 0,10,1010,111010,100111010,101100111010,110101100111010,
%T 111110101100111010,1000111110101100111010,10011000111110101100111010,
%U 101010011000111110101100111010,1011101010011000111110101100111010,11001011101010011000111110101100111010
%N a(n) is the concatenation n in base 2, n-1 in base 2, ..., 0 in base 2.
%H Seiichi Manyama, <a href="/A300571/b300571.txt">Table of n, a(n) for n = 0..155</a>
%F a(n) = A300570(n)*10. - _Chai Wah Wu_, Feb 26 2023
%o (Python)
%o from functools import reduce
%o def A300571(n): return int(bin(reduce(lambda i,j:(i<<j.bit_length())+j,range(n,0,-1),0))[2:])*10 # _Chai Wah Wu_, Feb 26 2023
%Y Cf. A007088, A058935, A300570.
%K nonn,base
%O 0,2
%A _Seiichi Manyama_, Mar 08 2018
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