MathDB

You are given a rectangular playing field of size

13 \times 2

and any number of dominoes of sizes

2\times 1

and

3\times 1

. The playing field should be seamless with such dominoes and without overlapping, with no domino protruding beyond the playing field may. Furthermore, all dominoes must be aligned in the same way, i. e. their long sides must be parallel to each other. How many such coverings are possible?
(Walther Janous)

Problem Statement