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 | 3 |
| 2 | 10 |
| 3 | 33 |
| 4 | 110 |
| 5 | 369 |
| 6 | 1247 |
| 7 | 4248 |
| 8 | 14603 |
| 9 | 50724 |
| 10 | 178314 |
| 11 | 635526 |
| 12 | 2300829 |
| 13 | 8477382 |
| 14 | 31842897 |
| 15 | 122103276 |
| 16 | 478372886 |
| 17 | 1915188093 |
| 18 | 7831613468 |
| 19 | 32674683984 |
| 20 | 138871668314 |
| 21 | 600140517762 |
| 22 | 2631926843602 |
| 23 | 11690520554421 |
| 24 | 52498671870181 |
| 25 | 237966449687118 |
| 26 | 1087246253873875 |
| 27 | 5001141997115010 |
| 28 | 23137102115963262 |