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 | 10 |
| 2 | 57 |
| 3 | 244 |
| 4 | 874 |
| 5 | 2772 |
| 6 | 8054 |
| 7 | 21920 |
| 8 | 56751 |
| 9 | 141326 |
| 10 | 341303 |
| 11 | 804276 |
| 12 | 1858080 |
| 13 | 4223784 |
| 14 | 9474444 |
| 15 | 21018144 |
| 16 | 46195149 |
| 17 | 100734354 |
| 18 | 218190469 |
| 19 | 469866964 |
| 20 | 1006759110 |
| 21 | 2147634364 |
| 22 | 4563581746 |
| 23 | 9663887808 |
| 24 | 20401343003 |
| 25 | 42949963286 |
| 26 | 90194651043 |
| 27 | 188978952404 |