>>> from catalan import catalan

--ini-enunciat
>>> it = catalan(10)
>>> for i in range(10):
...     print(i, ' - ', next(it))
... 
0  -  1
1  -  1
2  -  2
3  -  5
4  -  14
5  -  42
6  -  132
7  -  429
8  -  1430
9  -  4862

>>> next(it, 'final')
'final'

--fi-enunciat


>>> for c in it:
...     print(c)



>>> it=catalan(15)
>>> for c in it:
...     print(c, end='-')
1-1-2-5-14-42-132-429-1430-4862-16796-58786-208012-742900-2674440-