Ladder operator by rolf(clock)

while 1:
 K=D=J=int(input()*2)
 x=0;exec"x+=(J>0);J-=1;print'0 '*x+`D`+' 0'*J;K-=2;D+=K;"*-~J

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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