Pluggin a series of small matrices into a larger matrix (with addition)

New to Julia
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2 
julia> a
4×4 Matrix{Int64}:
 0  0  0  0
 0  0  0  0
 0  0  0  0
 0  0  0  0

julia> for i in 1:3
           window = CartesianIndices((i:i+1, i:i+1))
           a[window] .+= i
       end;

julia> a
4×4 Matrix{Int64}:
 1  1  0  0
 1  3  2  0
 0  2  5  3
 0  0  3  3

you have a typo, the 4 should be 5 because 2+3 right?

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