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 | 1 |
| 2 | 7 |
| 3 | 49 |
| 4 | 3339337 |
| 5 | 143591491 |
| 6 | 6174434113 |
| 7 | 259329572083 |
| 8 | 265500666859 |
| 9 | 11151171599569 |
| 10 | 11416528674937 |
| 11 | 479500378781467 |
| 12 | 490910733022291 |
| 13 | 20139275238393697 |
| 14 | 20618516287603081 |
| 15 | 21109161519958513 |
| 16 | 865988835250928971 |
| 17 | 886596200366932483 |
| 18 | 37237519915789945753 |
| 19 | 38123636615778096769 |