const rnum = require('rnum');
 
rnum(1);
//=> 5
 
rnum(1);
//=> 6
 
rnum(1);
//=> 9
 
rnum(2);
//=> 56
 
rnum(4);
//=> 9408
 
rnum(4);
//=> 3004
 
rnum(6);
//=> 586509
 
rnum(9);
//=> 965090084
 
rnum(12);
//=> 109654480023