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A172520 as a triangular array

1
23
245
3467
25689
45781011
2579101213
468911121415
367101113141617
45910121315161819
2781012141517182021
679111314161719202223
2581112

A172520 as a square array

1223242434262
344555665775
56677879898
788991010101111
91010111112121312
11121213131414
131414151516
1516161717
17181819
192020
2122
23

A172520 as an upper right triangle

1223242434262
344555665775
56677879898
788991010101111
91010111112121312
11121213131414
131414151516
1516161717
17181819
192020
2122
23

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Last modified September 29 15:17 EDT 2020. Contains 337432 sequences. (Running on oeis4.)