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) |
|---|---|
| 2 | 1 |
| 3 | 135 |
| 4 | 5478 |
| 5 | 165826 |
| 6 | 4494351 |
| 7 | 116294673 |
| 8 | 2949965020 |
| 9 | 74197080276 |
| 10 | 1859539731885 |
| 11 | 46535238000235 |
| 12 | 1163848723925346 |
| 13 | 29100851707716150 |
| 14 | 727566807977891803 |
| 15 | 18189614152200873621 |
| 16 | 454744658216502193656 |