@cacheit
def _nT(n, k):
    if k == 0:
        return 1 if k == n else 0
    return sum(_nT(n - k, j) for j in range(min(k, n - k) + 1))
ResolvePrefix.
dataset/ETHPy150Open sympy/sympy/sympy/functions/combinatorial/numbers.py/_nT--crossover with--dataset/ETHPy150Open google/grr/grr/lib/data_stores/mysql_advanced_data_store.py/MySQLAdvancedDataStore.ResolvePrefix