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A216031 as a triangular array

1
11
121
1221
15451
2122929122
2429737197422
513615346150615015341365
5602705016713014632716713070506025
152440188835521907030312074303120745219070188835244015
1512840

A216031 as a square array

1111122551515
12251242136602244012840
124299715347050188835
152937161501671305219070
11297615014632730312074
242153416713030312074
213670505219070
5602188835
52440
15
1111122551515
12251242136602244012840
124299715347050188835
152937161501671305219070
11297615014632730312074
242153416713030312074
213670505219070
5602188835
52440
15