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A209761 as a triangular array

1
12
254
310148
417343616
526681048832
63712024029620864
750194480776800480128
8652948681736235220801088256
982424145634725824678452482432512
10101588

A209761 as a square array

112345678910
2510172637506582101
4143468120194294424588
8361042404808681456
168829677617363472
3220880023525824
6448020806784
12810885248
2562432
512
112345678910
2510172637506582101
4143468120194294424588
8361042404808681456
168829677617363472
3220880023525824
6448020806784
12810885248
2562432
512