Find the lower Wythoff sequence up to n.
For more information, https://oeis.org/A000201
Replace NaNs with the number that appears to its left in the row.
radius of a spherical planet
Duplicate each element of a vector.
Removing rows from a matrix is easy - but what about inserting rows?
Create an 'arrow-head" matrix
Can the knight take out the pawn?
generate the matrix
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