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) |
|---|---|
| 6 | 17 |
| 7 | 259 |
| 8 | 2770 |
| 9 | 27978 |
| 10 | 294602 |
| 11 | 3331790 |
| 12 | 40682144 |
| 13 | 535206440 |
| 14 | 7557750635 |
| 15 | 114101726625 |
| 16 | 1834757172082 |
| 17 | 31313852523634 |
| 18 | 565434670633580 |
| 19 | 10771030900532868 |
| 20 | 215881317066455232 |
| 21 | 4541623615098815280 |