How many banner combinations are there in Minecraft?

How many banner combinations are there in Minecraft? A banner may have up to six layers of patterns, which are overlaid with the last-crafted on top. A banner can have up to 16 layers of patterns with the use of commands. The total number of unique banners is approximately 2.3×10^16 (or 23 quadrillion).

A banner may have up to six layers of patterns, which are overlaid with the last-crafted on top. A banner can have up to 16 layers of patterns with the use of commands. The total number of unique banners is approximately 2.3×10^16 (or 23 quadrillion).
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