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#!/usr/bin/perl -w

...
    }
    print "\n";
}

> parenperms 3 12
1: (((1)))2
...
8: ((1(2)))
9: (1((2)))
10: 1(((2)))

> parenperms 1..7 1..7
parens  lengths
...
    5:        1      21     196    1176    5292   19404   60984
    6:        1      28     336    2520   13860   60984  226512
    7:        1      36     540    4950   32670  169884  736164