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A004481 as a triangular array

0
11
222
3003
44144
555555
6336336
77422477
888070888
9661661669
101079989971010
1111111001010010111111
12991211311129912

A004481 as a square array

0123456789101112
12045378610119
201534867119
345620191012
453276901
534068101
67819103
786901
867101
9101112
10119
119
12

A004481 as an upper right triangle

0123456789101112
12045378610119
201534867119
345620191012
453276901
534068101
67819103
786901
867101
9101112
10119
119
12

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Last modified April 19 15:11 EDT 2024. Contains 371794 sequences. (Running on oeis4.)