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 | 3 |
| 3 | 3 |
| 4 | 19 |
| 5 | 97 |
| 6 | 97 |
| 7 | 453 |
| 8 | 65239 |
| 9 | 36697 |
| 10 | 5871521 |
| 11 | 3075559 |
| 12 | 775040869 |
| 13 | 10075531303 |
| 14 | 10075531303 |
| 15 | 2115861573641 |
| 16 | 2115861573641 |
| 17 | 22135167231937 |
| 18 | 941750751322411 |
| 19 | 39365181405276781 |
| 20 | 3936518140527678109 |