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 | 5 |
| 3 | 18 |
| 4 | 52 |
| 5 | 137 |
| 6 | 339 |
| 7 | 808 |
| 8 | 1874 |
| 9 | 4263 |
| 10 | 9553 |
| 11 | 21158 |
| 12 | 46416 |
| 13 | 101029 |
| 14 | 218447 |
| 15 | 469668 |
| 16 | 1004878 |
| 17 | 2140835 |
| 18 | 4543821 |
| 19 | 9611938 |
| 20 | 20272460 |
| 21 | 42642081 |
| 22 | 89478475 |
| 23 | 187345568 |
| 24 | 391468362 |
| 25 | 816491167 |
| 26 | 1700091209 |
| 27 | 3534400158 |
| 28 | 7337235784 |
| 29 | 15211342493 |