login

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”).

A156072 as a triangular array

1
11
101
1001
11111
112211
1123211
12344321
135666531
1479999741
161013141414131061
19151921222221191591
113222831333433312822131

A156072 as a square array

1111111111111
1001112346913
10122357101522
1123469131928
112469142131
11369142233
1259142234
137132133
14101931
161528
1922
113
1
1111111111111
1001112346913
10122357101522
1123469131928
112469142131
11369142233
1259142234
137132133
14101931
161528
1922
113
1