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A258708 as a triangular array

1
11
121
1331
15741
17141251
1925301861
1124266552671
11566132143913581
118992453342731404591
12214342971572847620457101

A258708 as a square array

11111111111
12357912151822
1371425426699143
14123066132245429
151855143334715
162691273728
1735140476
1845204
1957
110
1
11111111111
12357912151822
1371425426699143
14123066132245429
151855143334715
162691273728
1735140476
1845204
1957
110
1