(Translated by https://www.hiragana.jp/)
A138530 - OEIS
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A138530 as a triangular array

1
21
321
4121
52321
622321
7334321
81424321
921354321
10224254321
113353654321
1222342654321
13334537654321
143456427654321

A138530 as a square array

1234567891011121314
1212231223233
123234123234
12342345345
1234523456
123456234
12345672
1234567
123456
12345
1234
123
12
1
1234567891011121314
1212231223233
123234123234
12342345345
1234523456
123456234
12345672
1234567
123456
12345
1234
123
12
1