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A210976 as a triangular array

2
31
441
5621
68321
795321
81064321
912754321
10148754321
1115109654321
121611117654321
1318121287654321
1420

A210976 as a square array

234567891011121314
1468910121415161820
1235678101112
12345791112
12345678
1234567
123456
12345
1234
123
12
1
234567891011121314
1468910121415161820
1235678101112
12345791112
12345678
1234567
123456
12345
1234
123
12
1