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 | 5 |
| 3 | 16 |
| 4 | 61 |
| 5 | 258 |
| 6 | 1161 |
| 7 | 5440 |
| 8 | 26233 |
| 9 | 129282 |
| 10 | 648141 |
| 11 | 3294864 |
| 12 | 16943733 |
| 13 | 87983106 |
| 14 | 460676625 |
| 15 | 2429478144 |
| 16 | 12893056497 |
| 17 | 68802069506 |
| 18 | 368961496469 |
| 19 | 1987323655056 |
| 20 | 10746633315501 |
| 21 | 58321460916482 |
| 22 | 317537398625945 |