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doublerup
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Rozjemca35
Symmetrical identicons mean n =15 pixels. Σ from k=1 to k=15 N = n!/(k!*(n-k)!) equals to 32767 different, symmetrical through y-axis identicons. That's my answer.
I think k should start at 0. Then 2^15=32768
https://en.wikipedia.org/wiki/Binomial_coefficient#Sums_of_the_binomial_coefficients
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Rozjemca35
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You are right, If identicon can be completely blank.
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