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%I #25 Jun 15 2021 14:32:32
%S 1,10,91,739,5275,32491,168571,712891,2345851,5611771,8877691,8877691,
%T 8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691,
%U 8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691,8877691
%N a(n) is the number of nonnegative numbers < 10^n with all digits distinct.
%C a(n) = a(10) for n > 10 by the pigeonhole principle.
%F a(0) = 1; a(n) = A073531(n) + a(n-1).
%Y Cf. A073531.
%K nonn,base
%O 0,2
%A _Quan Tran_, May 16 2021