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A177877 as a triangular array

1
24
3710
4101620
513223035
61628405056
7193450657784
82240608098112120
925467095119140156165
10285280110140168192210220

A177877 as a square array

12345678910
4710131619222528
1016222834404652
20304050607080
3550658095110
567798119140
84112140168
120156192
165210
220
12345678910
4710131619222528
1016222834404652
20304050607080
3550658095110
567798119140
84112140168
120156192
165210
220