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A131421 as a triangular array

1
35
579
791113
911131517
111315171921
13151719212325
1517192123252729
171921232527293133
19212325272931333537
2123252729313335373941

A131421 as a square array

13579111315171921
57911131517192123
91113151719212325
1315171921232527
17192123252729
212325272931
2527293133
29313335
333537
3739
41
13579111315171921
57911131517192123
91113151719212325
1315171921232527
17192123252729
212325272931
2527293133
29313335
333537
3739
41