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A221999 as a triangular array

2
23
234
2346
234610
23461015
2346101522
234610152235
23471015223654
2347111524365681
2347111625395684125
2347111627406084133193
2347111627

A221999 as a square array

2222222222222
333333333333
44444444444
6666677777
101010101011111111
1515151515161616
22222224252727
3536363940
54565660
818484
125133
193

A221999 as an upper right triangle

2222222222222
333333333333
44444444444
6666677777
101010101011111111
1515151515161616
22222224252727
3536363940
54565660
818484
125133
193

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Last modified August 5 18:17 EDT 2024. Contains 374954 sequences. (Running on oeis4.)