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 | 2 |
| 3 | 7 |
| 4 | 29 |
| 5 | 129 |
| 6 | 602 |
| 7 | 2910 |
| 8 | 14447 |
| 9 | 73234 |
| 10 | 377487 |
| 11 | 1972568 |
| 12 | 10425930 |
| 13 | 55640282 |
| 14 | 299403552 |
| 15 | 1622701202 |
| 16 | 8850030065 |
| 17 | 48534971244 |
| 18 | 267486182192 |
| 19 | 1480673755443 |
| 20 | 8228819436898 |
| 21 | 45895682480965 |
| 22 | 256815165790211 |
| 23 | 1441321638029496 |
| 24 | 8111194646903282 |