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Advent calendar 2019

4 December

There are 5 ways to tile a 3×2 rectangle with 2×2 squares and 2×1 dominos.
Today's number is the number of ways to tile a 9×2 rectangle with 2×2 squares and 2×1 dominos.

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Advent calendar 2020

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Sunday Afternoon Maths LXVII

Coloured weights
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