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A121301 as a triangular array

1
11
401
10201
285001
75103001
2022370001
54057840001
144012918900001
38282944310500001
10153680901111000001
26875155717828126000001
7102135463626913130000001

A121301 as a square array

11410287520254014403828101532687571021
102510235712929468015573546
100378184390178362
10004910112869
100005111213
100000613
1000000
100000
10000
1000
100
10
1
11410287520254014403828101532687571021
102510235712929468015573546
100378184390178362
10004910112869
100005111213
100000613
1000000
100000
10000
1000
100
10
1