If you have H hidden nodes you can reorder them H! ways.
If you have an odd parity transfer function you can change the sign of its input weights and counter that by changing the sign of it's output weight.
Consequently, there are M = H! *2^H different nets that have identical input/output performance.
The default value of H = 10 yields M = 3.7159e+09.
Hope this helps.
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Greg
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