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A218890 as a triangular array

1
23
654
10987
1112131415
161718192021
28272625242322
3635343332313029
373839404142434445
46474849505152535455
6665646362616059585756
78

A218890 as a square array

126101116283637466678
35912172735384765
4813182634394864
714192533404963
15202432415062
212331425161
2230435260
29445359
455458
5557
56
126101116283637466678
35912172735384765
4813182634394864
714192533404963
15202432415062
212331425161
2230435260
29445359
455458
5557
56