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A004489 as a triangular array

0
11
222
3003
44144
555555
6336336
77477477
888888888
9660660669
101071171171010
111111222222111111
12991200300129912
131310131314411313101313

A004489 as a square array

012345678910111213
1204537861011913
20153486711910
3456780121213
45378612013
534867201
67801234
7861204
867201
910111213
1011913
11910
1213
13
012345678910111213
1204537861011913
20153486711910
3456780121213
45378612013
534867201
67801234
7861204
867201
910111213
1011913
11910
1213
13