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A378706 as a triangular array

3
48
51016
6122533
714295463
8163369118119
9183777152251219
10204185177335521398
112245931933907271071714
122449101209433856155721761269
1326531092254659481859329743802237

A378706 as a square array

345678910111213
8101214161820222426
162529333741454953
335469778593101109
63118152177193209225
119251335390433465
219521727856948
398107115571859
71421763297
12694380
2237
345678910111213
8101214161820222426
162529333741454953
335469778593101109
63118152177193209225
119251335390433465
219521727856948
398107115571859
71421763297
12694380
2237