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%I #7 Mar 05 2024 14:13:29
%S 1,21,341,4981,51627161,6256481321,736125256243641,
%T 84921662510247291281,96434312963125409621872561,
%U 108151224017776156251638465615121,111007294096168074665678125655361968310241,1212110006561327681176492799363906252621445904920481
%N a(n) is the concatenation of n, (n-1)^2, (n-2)^3, (n-3)^4, ..., 2^(n-1) and 1.
%t Table[FromDigits[Flatten[IntegerDigits[Range[n,1,-1]^Range[n]]]],{n,12}] (* _Jayanta Basu_, May 21 2013 *)
%K base,easy,nonn
%O 1,2
%A _Amarnath Murthy_, Mar 04 2002