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Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A378198 as a triangular array

1
21
421
3321
54421
653321
7654421
107653321
13167654421
161497653321
8917137654421
11101312147653321
148161411177654421
1717109178127653321
19121216131210117

A378198 as a square array

1243567101316811141719
1234567161491081712
124356791713161012
1234567131214916
124356714111713
123456717812
12435671210
123456711
1243567
12345
1243
123
12
1
1243567101316811141719
1234567161491081712
124356791713161012
1234567131214916
124356714111713
123456717812
12435671210
123456711
1243567
12345
1243
123
12
1