in lattices/Zn_lattice.py [0:0]
def __init__(self, npas=100):
pascal = [[1] for i in range(npas)]
for i in range(npas):
for j in range(1, i + 1):
pascal[i].append(pascal[i - 1][j] + pascal[i - 1][j - 1])
pascal[i].append(0)
self.pascal = pascal