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 | 93 |
| 5 | 322 |
| 6 | 1091 |
| 7 | 3642 |
| 8 | 12025 |
| 9 | 39362 |
| 10 | 127935 |
| 11 | 413338 |
| 12 | 1328597 |
| 13 | 4251522 |
| 14 | 13551739 |
| 15 | 43046714 |
| 16 | 136314609 |
| 17 | 430467202 |
| 18 | 1355971703 |
| 19 | 4261625370 |
| 20 | 13366006861 |
| 21 | 41841412802 |
| 22 | 130754415027 |
| 23 | 407953774906 |
| 24 | 1270932914153 |