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) |
|---|---|
| 3 | 10 |
| 4 | 18 |
| 5 | 82 |
| 6 | 146 |
| 7 | 658 |
| 8 | 1170 |
| 9 | 5266 |
| 10 | 9362 |
| 11 | 42130 |
| 12 | 74898 |
| 13 | 337042 |
| 14 | 599186 |
| 15 | 2696338 |
| 16 | 4793490 |
| 17 | 21570706 |
| 18 | 38347922 |
| 19 | 172565650 |
| 20 | 306783378 |
| 21 | 1380525202 |
| 22 | 2454267026 |
| 23 | 11044201618 |
| 24 | 19634136210 |
| 25 | 88353612946 |
| 26 | 157073089682 |
| 27 | 706828903570 |
| 28 | 1256584717458 |
| 29 | 5654631228562 |