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A099375 as a triangular array

1
31
531
7531
97531
1197531
131197531
15131197531
1715131197531
191715131197531
21191715131197531
2321191715131197531
25232119171513119

A099375 as a square array

135791113151719212325
1357911131517192123
13579111315171921
135791113151719
1357911131517
13579111315
135791113
1357911
13579
135
13
1
135791113151719212325
1357911131517192123
13579111315171921
135791113151719
1357911131517
13579111315
135791113
1357911
13579
135
13
1