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A173541 as a triangular array

0
00
020
0030
02340
000450
0234560
00305670
020456780
0034067890
023456789100
00005078910110
0234567891011120
0034560891011

A173541 as a square array

00000000000000
0202020202020
033033033033
04440444044
0555505555
066666066
07777770
0888888
099999
010101010
0111111
012
0
00000000000000
0202020202020
033033033033
04440444044
0555505555
066666066
07777770
0888888
099999
010101010
0111111
012
0