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 | 2 |
| 1 | 5 |
| 2 | 17 |
| 3 | 77 |
| 4 | 381 |
| 5 | 1851 |
| 6 | 8893 |
| 7 | 41741 |
| 8 | 191755 |
| 9 | 868151 |
| 10 | 3875933 |
| 11 | 17120309 |
| 12 | 74950547 |
| 13 | 325590115 |
| 14 | 1405167561 |
| 15 | 6029676711 |
| 16 | 25750781177 |
| 17 | 109495928099 |
| 18 | 463852117169 |
| 19 | 1958476902435 |
| 20 | 8244703036797 |
| 21 | 34615624751259 |
| 22 | 144991244981985 |
| 23 | 605994279458465 |
| 24 | 2527803622205465 |