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A325309 as a triangular array

1
21
421
6321
84321
1064321
12864321
169854321
18109654321
2012128654321
2115161010654321
24161812127654321
3218

A325309 as a square array

124681012161820212432
12346891012151618
1234689121618
12345681012
1234561012
1234567
123456
12345
1234
123
12
1
124681012161820212432
12346891012151618
1234689121618
12345681012
1234561012
1234567
123456
12345
1234
123
12
1