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A131925 as a triangular array

1
53
575
9797
9119119
131113111311
13151315131513
1715171517151715
171917191719171917

A131925 as a square array

1559913131717
3771111151519
59913131717
71111151519
913131717
11151519
131717
1519
17

A131925 as an upper right triangle

1559913131717
3771111151519
59913131717
71111151519
913131717
11151519
131717
1519
17

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Last modified September 6 13:38 EDT 2024. Contains 375712 sequences. (Running on oeis4.)