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%I #12 Oct 30 2019 17:26:57
%S 1,1,2,4,3,7,6,5,4,7,6,5,12,11,10,9,8,7,6,12,11,10,9,8,7,12,11,10,9,8,
%T 12,11,10,9,16,15,14,13,12,11,10,16,15,14,13,12,11,16,15,14,13,12,24,
%U 23,22,21,20,19,18,17,16,15,14,13,24,23,22,21,20,19,18,17,16,15,14,24,23
%N a(0)=1. For n>=1, n-th run consists of the integers in descending order of a(n-1)+n-1 through n.
%e The sequence grouped by descending runs, where the n-th run, for n>=1, consists of a(n-1) integers: 1, (1), (2), (4, 3), (7, 6, 5, 4), (7, 6, 5), (12, 11, 10, 9, 8, 7, 6), (12, 11, 10, 9, 8, 7), (12, 11, 10, 9, 8), (12, 11, 10, 9), ...
%t f[l_List] := Block[{n = Length[l]},Append[l, Range[Flatten[l][[n]] + n - 1, n, -1]]];Flatten@Nest[f, {{1}}, 15] (* _Ray Chandler_, Jan 04 2007 *)
%K easy,nonn
%O 0,3
%A _Leroy Quet_, Jan 02 2007
%E Extended by _Ray Chandler_, Jan 04 2007
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