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A130212 as a triangular array

1
21
312
4222
52224
634242
7342426
84444264
946442646
10564826464
1156482646410
12686846464104
1368684646410412

A130212 as a square array

12345678910111213
112233445566
22244466688
2222444466
444448888
22222244
6666666
444444
66666
4444
101010
44
12

A130212 as an upper right triangle

12345678910111213
112233445566
22244466688
2222444466
444448888
22222244
6666666
444444
66666
4444
101010
44
12

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Last modified July 16 10:51 EDT 2024. Contains 374345 sequences. (Running on oeis4.)