printpascal = (n) :
   if (n < 1) :
      1 print
      (1)
   . else :
      prev = printpascal(n - 1)
      prev append(0)
      curr = (1)
      n times (i):
         curr append(prev(i) + prev(i + 1))
      .
      "\n" print
      curr join(", ") print
      curr
   .
.

printpascal(read number integer)