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A204004 as a triangular array

1
33
545
7667
98789
1110991011
13121110111213
1514131212131415
171615141314151617
19181716151516171819
2120191817161718192021
232221201918

A204004 as a square array

1357911131517192123
346810121416182022
5679111315171921
789101214161820
910111213151719
11121314151618
1314151617
15161718
171819
1920
21
1357911131517192123
346810121416182022
5679111315171921
789101214161820
910111213151719
11121314151618
1314151617
15161718
171819
1920
21