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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 26 |
| 5 | 95 |
| 6 | 345 |
| 7 | 1252 |
| 8 | 4544 |
| 9 | 16493 |
| 10 | 59864 |
| 11 | 217286 |
| 12 | 788674 |
| 13 | 2862617 |
| 14 | 10390321 |
| 15 | 37713313 |
| 16 | 136886433 |
| 17 | 496850954 |
| 18 | 1803399103 |
| 19 | 6545722210 |
| 20 | 23758733815 |
| 21 | 86236081273 |
| 22 | 313007493212 |
| 23 | 1136110191472 |
| 24 | 4123691589365 |
| 25 | 14967590689568 |