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 | 7 |
| 3 | 26 |
| 4 | 100 |
| 5 | 392 |
| 6 | 1555 |
| 7 | 6218 |
| 8 | 25006 |
| 9 | 100988 |
| 10 | 409162 |
| 11 | 1661948 |
| 12 | 6764194 |
| 13 | 27575732 |
| 14 | 112570675 |
| 15 | 460058906 |
| 16 | 1881978694 |
| 17 | 7704907724 |
| 18 | 31566153058 |
| 19 | 129400608044 |
| 20 | 530734613920 |
| 21 | 2177792579072 |
| 22 | 8939838222718 |
| 23 | 36711025334948 |