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A361261 as a triangular array

2
33
454
5665
68886
79101097
810111111108
91213131313129
101314151515141310
11141516161616151411
1215171818181818171512
131718192020202019181713

A361261 as a square array

2345678910111213
35689101213141517
46810111314151718
5810111315161819
69111315161820
7101315161820
81214161820
913151820
10141719
111518
1217
13
2345678910111213
35689101213141517
46810111314151718
5810111315161819
69111315161820
7101315161820
81214161820
913151820
10141719
111518
1217
13