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 | 6 |
| 3 | 13 |
| 4 | 29 |
| 5 | 68 |
| 6 | 156 |
| 7 | 357 |
| 8 | 821 |
| 9 | 1886 |
| 10 | 4330 |
| 11 | 9945 |
| 12 | 22841 |
| 13 | 52456 |
| 14 | 120472 |
| 15 | 276681 |
| 16 | 635433 |
| 17 | 1459354 |
| 18 | 3351598 |
| 19 | 7697381 |
| 20 | 17678037 |
| 21 | 40599916 |
| 22 | 93242996 |
| 23 | 214144685 |
| 24 | 491811165 |
| 25 | 1129508406 |
| 26 | 2594063186 |
| 27 | 5957604017 |
| 28 | 13682413681 |
| 29 | 31423445328 |
| 30 | 72168035504 |
| 31 | 165743294353 |