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 | 105 |
| 7 | 317 |
| 8 | 982 |
| 9 | 3105 |
| 10 | 9981 |
| 11 | 32520 |
| 12 | 107157 |
| 13 | 356481 |
| 14 | 1195662 |
| 15 | 4038909 |
| 16 | 13728369 |
| 17 | 46919812 |
| 18 | 161143157 |
| 19 | 555857157 |
| 20 | 1924956954 |
| 21 | 6689953057 |
| 22 | 23325404153 |
| 23 | 81567552320 |
| 24 | 286009944649 |
| 25 | 1005371062561 |
| 26 | 3542175587306 |