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A177878 as a triangular array

1
20
312
4240
53623
648460
75106934
8612812680
9714101591245
10816121812168100
1191814211520121556
12102016241824162010120

A177878 as a square array

123456789101112
012345678910
2468101214161820
0246810121416
3691215182124
0369121518
4812162024
0481216
5101520
0510
612
0
123456789101112
012345678910
2468101214161820
0246810121416
3691215182124
0369121518
4812162024
0481216
5101520
0510
612
0