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A247976 as a triangular array

1
11
112
1212
12133
133133
1331464
14641464
14641510105
15101051510105
1510105161520156
161520156161520156
16152015617213535217

A247976 as a square array

1111111111111
112233445566
211336610101515
23114410102020
33411551515
36451166
46105611
410101567
510201521
5152035
61535
621
7
1111111111111
112233445566
211336610101515
23114410102020
33411551515
36451166
46105611
410101567
510201521
5152035
61535
621
7