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A261318 as a triangular array

1
00
011
0031
011081
003050151
0191280155241
0027314911365371351
018207728110464704756481
002460394608505053382130201380631

A261318 as a square array

1000000000
010101010
131030912738202460
18502801491772839460
11515513651104685050
124371470453382
13575613020
1481380
163
1
1000000000
010101010
131030912738202460
18502801491772839460
11515513651104685050
124371470453382
13575613020
1481380
163
1