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A173588 as a triangular array

1
21
351
421101
58591171
6341820273261
7136573814369651371
854616643069905162761333501
9218455978711118481406901479892451651
10873815380840178956971017252617276051201004161821

A173588 as a square array

12345678910
152185341136554612184587381
110918207381664305978715380840
117273436969905111848117895697
1266511627640690110172526
1371333479891727605
1502451120100
1654161
182
1
12345678910
152185341136554612184587381
110918207381664305978715380840
117273436969905111848117895697
1266511627640690110172526
1371333479891727605
1502451120100
1654161
182
1