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