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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 11 |
| 6 | 39 |
| 7 | 103 |
| 8 | 367 |
| 9 | 1235 |
| 10 | 4439 |
| 11 | 15935 |
| 12 | 58509 |
| 13 | 215251 |
| 14 | 799697 |
| 15 | 2983217 |
| 16 | 11187567 |
| 17 | 42109451 |
| 18 | 159082753 |
| 19 | 602809327 |
| 20 | 2290684251 |
| 21 | 8726308317 |
| 22 | 33318661277 |
| 23 | 127479700199 |
| 24 | 488672302909 |
| 25 | 1876500180291 |
| 26 | 7217308815887 |
| 27 | 27799998949873 |
| 28 | 107228568948547 |