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A208523 as a triangular array

1
13
135
13711
1391921
1311274343
1313356910385
13154399183231171
131751133283449523341
13195917140374711071155683
1321672135431133197126372543

A208523 as a square array

11111111111
3333333333
579111315171921
1119273543515967
21436999133171213
43103183283403543
852314497471133
17152311071971
34111552637
6832543
11111111111
3333333333
579111315171921
1119273543515967
21436999133171213
43103183283403543
852314497471133
17152311071971
34111552637
6832543