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”).

A111669 as a triangular array

1
11
121
1341
141171
152632121
165712292201
17120423582252331
18247138933332598681541
1950244141805424117114511815881
110101313744946842109901729804956648071431

A111669 as a square array

11111111111
12345678910
141126571202475021013
17321224231389441413744
1129258233331805494684
120252259824117210990
13368111451172980
154181549566
1884807
1143
1
11111111111
12345678910
141126571202475021013
17321224231389441413744
1129258233331805494684
120252259824117210990
13368111451172980
154181549566
1884807
1143
1