This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 441 |
| 3 | 6815 |
| 4 | 90051 |
| 5 | 1108969 |
| 6 | 13275381 |
| 7 | 157347899 |
| 8 | 1859567103 |
| 9 | 21962353421 |
| 10 | 259365424097 |
| 11 | 3063049674271 |
| 12 | 36174616727819 |
| 13 | 427225636505145 |
| 14 | 5045588330345405 |
| 15 | 59589072289828011 |
| 16 | 703755006991845799 |