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 | 5 |
| 4 | 13 |
| 5 | 36 |
| 6 | 104 |
| 7 | 313 |
| 8 | 977 |
| 9 | 3152 |
| 10 | 10486 |
| 11 | 35880 |
| 12 | 126039 |
| 13 | 453725 |
| 14 | 1671322 |
| 15 | 6291148 |
| 16 | 24170312 |
| 17 | 94680426 |
| 18 | 377788108 |
| 19 | 1534169595 |
| 20 | 6335718925 |
| 21 | 26589240583 |
| 22 | 113323479393 |
| 23 | 490203781505 |
| 24 | 2150975413846 |
| 25 | 9569147610181 |
| 26 | 43140286838567 |