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A209998 as a triangular array

1
23
289
2103027
2104610881
21050198378243
210502428101296729
210502501122318643742187
210502501234498612150145806561
210502501250594621330451984811419683

A209998 as a square array

1222222222
3810101010101010
930465050505050
27108198242250250250
81378810112212341250
2431296318649865946
72943741215021330
21871458045198
656148114
19683

A209998 as an upper right triangle

1222222222
3810101010101010
930465050505050
27108198242250250250
81378810112212341250
2431296318649865946
72943741215021330
21871458045198
656148114
19683

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Last modified March 28 04:13 EDT 2024. Contains 371235 sequences. (Running on oeis4.)