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) |
|---|---|
| 5 | 52 |
| 6 | 675 |
| 7 | 5190 |
| 8 | 30710 |
| 9 | 154410 |
| 10 | 693667 |
| 11 | 2867370 |
| 12 | 11114495 |
| 13 | 40923980 |
| 14 | 144467430 |
| 15 | 492315490 |
| 16 | 1628069915 |
| 17 | 5246037340 |
| 18 | 16524577355 |
| 19 | 51016494920 |
| 20 | 154706348228 |
| 21 | 461635818560 |
| 22 | 1357490142605 |
| 23 | 3938873183155 |
| 24 | 11289577084470 |
| 25 | 31993411507279 |
| 26 | 89716807311725 |
| 27 | 249130011081065 |