>>> from n_tetraedric import n_senars_tetraedrics

--ini-enunciat

>>> it = n_senars_tetraedrics(5)
>>> for t in it:
...      print(t, end='-')
1-35-165-455-969-
>>> next(it, 'fi') # comprovem que l'iterador s'ha exhaurit
'fi'

--fi-enunciat

>>> it = n_senars_tetraedrics(20)
>>> for t in it:
...      print(t, end='-')
1-35-165-455-969-1771-2925-4495-6545-9139-12341-16215-20825-26235-32509-39711-47905-57155-67525-79079-

>>> import itertools
>>> it = n_senars_tetraedrics(100)
>>> for t in itertools.islice(it, 90, 100):
...      print(t, end='-')
7906261-8171255-8442105-8718875-9001629-9290431-9585345-9886435-10193765-10507399-