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A143724 as a triangular array

1
12
104
1205
10009
124007
10000015
120500012
1040000018
12009000015
100000000028
1245070000016

A143724 as a square array

111111111111
20202020202
4004004004
500050005
90000900
7000007
1500000
120000
18000
1500
280
16
111111111111
20202020202
4004004004
500050005
90000900
7000007
1500000
120000
18000
1500
280
16