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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 7 |
| 5 | 7 |
| 6 | 11 |
| 7 | 143 |
| 8 | 715 |
| 9 | 2431 |
| 10 | 4199 |
| 11 | 29393 |
| 12 | 52003 |
| 13 | 37145 |
| 14 | 7429 |
| 15 | 215441 |
| 16 | 392863 |
| 17 | 4321493 |
| 18 | 7960645 |
| 19 | 58908773 |
| 20 | 109402007 |
| 21 | 407771117 |
| 22 | 762354697 |
| 23 | 3811773485 |
| 24 | 35830670759 |
| 25 | 19293438101 |
| 26 | 327988447717 |
| 27 | 2483341104143 |
| 28 | 4709784852685 |
| 29 | 17897182440203 |
| 30 | 34062379482967 |