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A278492 as a triangular array

1
21
331
4531
57731
699731
7111313731
813151513731
91519191913731
10172125251913731
1119252727271913731
122127313131271913731
13233137393939271913731

A278492 as a square array

12345678910111213
1357911131517192123
137913151921252731
13713151925273137
137131925273139
1371319273139
13713192739
137131927
1371319
13713
137
13
1
12345678910111213
1357911131517192123
137913151921252731
13713151925273137
137131925273139
1371319273139
13713192739
137131927
1371319
13713
137
13
1