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A258306 as a triangular array

1
11
112
1135
114714
11592343
116113471141
1171347105255490
11815621454119111785
1191779191615149635356789
11101998243873226961691390326809

A258306 as a square array

11111111111
1111111111
2345678910
5791113151719
14233447627998
4371105145191243
141255411615873
49091114962269
178535356169
678913903
26809
11111111111
1111111111
2345678910
5791113151719
14233447627998
4371105145191243
141255411615873
49091114962269
178535356169
678913903
26809