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”).

A101515 as a triangular array

1
11
121
1331
14741
15131351
1621352161
173177773171
18431462361464381
19572495965962495791
1107339312902037129039373101
111915852486577257722486585

A101515 as a square array

111111111111
1234567891011
13713213143577391
14133577146249393585
15217723659612902486
163114659620375772
174324912905772
18573932486
1973585
110
1
111111111111
1234567891011
13713213143577391
14133577146249393585
15217723659612902486
163114659620375772
174324912905772
18573932486
1973585
110
1