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A131911 as a triangular array

1
43
525
8127
92129
12121211
132121213
1612121215
17212121217
201212121219

A131911 as a square array

145891213161720
321212121
52121212
7212121
921212
112121
13212
1521
172
19

A131911 as an upper right triangle

145891213161720
321212121
52121212
7212121
921212
112121
13212
1521
172
19

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Last modified March 29 05:43 EDT 2024. Contains 371264 sequences. (Running on oeis4.)