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) |
|---|---|
| 4 | 1 |
| 5 | 46 |
| 6 | 551 |
| 7 | 3785 |
| 8 | 18955 |
| 9 | 77533 |
| 10 | 276408 |
| 11 | 895103 |
| 12 | 2708322 |
| 13 | 7811510 |
| 14 | 21791338 |
| 15 | 59419294 |
| 16 | 159571139 |
| 17 | 424302452 |
| 18 | 1121168305 |
| 19 | 2951121095 |
| 20 | 7749900701 |
| 21 | 20324325571 |
| 22 | 53259796514 |
| 23 | 139506540045 |
| 24 | 365330860180 |
| 25 | 956582678652 |
| 26 | 2504546934692 |
| 27 | 6557230277964 |
| 28 | 17167369784405 |