ICUP by leonid

while 1:
 n=input();a=': 1'+' _'*~-n;k=1;i=n|1;j=n*2
 while~-i:
\x09if-j<~i:k+=1;a=a[:j]+`k`+a[j+1:]
\x09i-=i/j*2;j=a.find(' _'*i)+i
 print`n`+a

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

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