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A307988 as a triangular array

1
21
120
4741
113642182
14121344259482
295182750406816521724
722059219246546152368109625889
12781361749861048950167794069928874998203414
2423289313985761677879153686584447387829587880524475730824

A307988 as a square array

121411142972127242
127361215182059813632893
04423442750219241749861398576
118259406865461104895016778791
248165252368167794053686584
21721096269928844738782
4588749989587880
92034524475
147308
24
121411142972127242
127361215182059813632893
04423442750219241749861398576
118259406865461104895016778791
248165252368167794053686584
21721096269928844738782
4588749989587880
92034524475
147308
24