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 | 3 |
| 2 | 10 |
| 3 | 35 |
| 4 | 127 |
| 5 | 467 |
| 6 | 1736 |
| 7 | 6510 |
| 8 | 24591 |
| 9 | 93427 |
| 10 | 356620 |
| 11 | 1366586 |
| 12 | 5254256 |
| 13 | 20259304 |
| 14 | 78309078 |
| 15 | 303346956 |
| 16 | 1177325247 |
| 17 | 4577098533 |
| 18 | 17821458618 |
| 19 | 69484705346 |
| 20 | 271251048911 |
| 21 | 1060085370591 |
| 22 | 4147198630980 |
| 23 | 16239629491179 |