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 | 17 |
| 1 | 73 |
| 2 | 241 |
| 3 | 1009 |
| 4 | 2641 |
| 5 | 8089 |
| 6 | 18001 |
| 7 | 53881 |
| 8 | 87481 |
| 9 | 117049 |
| 10 | 515761 |
| 11 | 1083289 |
| 12 | 3206641 |
| 13 | 3818929 |
| 14 | 9257329 |
| 15 | 22000801 |
| 16 | 48473881 |
| 17 | 48473881 |
| 18 | 175244281 |
| 19 | 427733329 |
| 20 | 427733329 |
| 21 | 898716289 |
| 22 | 2805544681 |
| 23 | 2805544681 |
| 24 | 2805544681 |