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 | 2 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 27 |
| 7 | 88 |
| 8 | 328 |
| 9 | 1460 |
| 10 | 7799 |
| 11 | 51196 |
| 12 | 422521 |
| 13 | 4483460 |
| 14 | 62330116 |
| 15 | 1150504224 |
| 16 | 28434624153 |
| 17 | 945480850638 |
| 18 | 42417674401330 |
| 19 | 2572198227615998 |
| 20 | 211135833162079184 |
| 21 | 23487811567341121158 |
| 22 | 3545543330739039981738 |
| 23 | 727053904070651775719646 |