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A210880 as a triangular array

1
21
352
4773
5910125
6111317198
7131622273113
815192735445021
91722324357718134
1019253751709211513155
11212842598311314918621289
12233147

A210880 as a square array

123456789101112
157911131517192123
271013161922252831
31217222732374247
5192735435159
83144577083
13507192113
2181115149
34131186
55212
89
123456789101112
157911131517192123
271013161922252831
31217222732374247
5192735435159
83144577083
13507192113
2181115149
34131186
55212
89