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A249821 as a triangular array

1
21
321
4321
55321
645321
7775321
8111175321
96131175321
101317131175321
1117417131175321
1210191917131175321
131923231917131175321
149629231917131175321
158293129231917131175321

A249821 as a square array

123456789101112131415
1235471161317101998
1235711131741923629
1235711131719232931
12357111317192329
123571113171923
1235711131719
12357111317
123571113
1235711
12357
1235
123
12
1
123456789101112131415
1235471161317101998
1235711131741923629
1235711131719232931
12357111317192329
123571113171923
1235711131719
12357111317
123571113
1235711
12357
1235
123
12
1