{{WalshPermMatInvStr|724}} gives pzznpznzp
{{WalshPermMatInvStr|724}}
which stands for
p z z n p z n z p
with n, z, p representing -1, 0, 1.
This is used in {{FanoColl}}. {{FanoColl|7|2|4}} gives
{{FanoColl|7|2|4}}
724