1  2  ⋯ (i-1) i (i+1) ⋯  n
     +----------------------------
 1   | 0  0  ⋯   0   aᵢ  aᵢ  ⋯  aᵢ
 2   | 0  0  ⋯   0   aᵢ  aᵢ  ⋯  aᵢ
 ⋮  ⋮⋮ ⋮      ⋮  ⋮   ⋮  ⋮ ⋮
aᵢ   | 0  0  ⋯   0   aᵢ  aᵢ  ⋯  aᵢ
aᵢ₊₁ | 0  0  ⋯   0   0   0   ⋯  0
 ⋮  ⋮⋮ ⋮      ⋮  ⋮   ⋮  ⋮ ⋮
 m   | 0  0  ⋯   0   0   0   ⋯  0

[2 2 2 2]   [0 1 1 1]   [0 0 3 3]   [0 0 0 1]   [2 3 6 7]
[2 2 2 2] + [0 0 0 0] + [0 0 3 3] + [0 0 0 0] = [2 2 5 5]
[0 0 0 0]   [0 0 0 0]   [0 0 3 3]   [0 0 0 0]   [0 0 3 3]

[0] -> [] or [[]]
[1] -> [[1]]
[3] -> [[3],[3],[3]]
[2,2] -> [[2,4],[2,4]]
[3,0,0] -> [[3,3,3],[3,3,3],[3,3,3]]
[1,2,3,4,5] -> [[1,3,6,10,15],[0,2,5,9,14],[0,0,3,7,12],[0,0,0,4,9],[0,0,0,0,5]]
[10,1,0,3,7,8] -> [[10,11,11,14,21,29],[10,10,10,13,20,28],[10,10,10,13,20,28],[10,10,10,10,17,25],[10,10,10,10,17,25],[10,10,10,10,17,25],[10,10,10,10,17,25],[10,10,10,10,10,18],[10,10,10,10,10,10],[10,10,10,10,10,10]]