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%I #14 Feb 18 2022 22:28:24
%S 0,1,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,
%T 1,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,0,0,0,
%U 0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0
%N Shift operator, left.
%C Let A129185 = M, then M*V (V a vector), shifts V to the left. Example M*V, V = [1, 2, 3, ...] = [2, 3, 4, ...]. A129184 = right shift operator.
%H Franck Ramaharo, <a href="https://arxiv.org/abs/2002.06672">A bracket polynomial for 2-tangle shadows</a>, arXiv:2002.06672 [math.CO], 2020.
%F As an infinite matrix, all 1's in the superdiagonal and the rest zeros.
%e First few rows of the matrix:
%e 0, 1;
%e 0, 0, 1;
%e 0, 0, 0, 1;
%e 0, 0, 0, 0, 1;
%e ...
%t Table[PadLeft[{1},n,0],{n,20}]//Flatten//Rest (* _Harvey P. Dale_, Jul 11 2020 *)
%Y Cf. A129184, A129186.
%K nonn,tabf,easy,less
%O 1,1
%A _Gary W. Adamson_, Apr 01 2007