Restricted growth arrays

These combinatorial objects are in bijection with set partitions.

class sage.combinat.restricted_growth.RestrictedGrowthArrays(n)

Bases: UniqueRepresentation, Parent

EXAMPLES:

sage: from sage.combinat.restricted_growth import RestrictedGrowthArrays
sage: R = RestrictedGrowthArrays(3)
sage: R == loads(dumps(R))
True
sage: TestSuite(R).run(skip=['_test_an_element',
....:   '_test_enumerated_set_contains', '_test_some_elements'])

cardinality()

EXAMPLES:

sage: from sage.combinat.restricted_growth import RestrictedGrowthArrays
sage: R = RestrictedGrowthArrays(6)
sage: R.cardinality()
203