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) |
|---|---|
| 1 | 1 |
| 2 | 32 |
| 3 | 3 |
| 4 | 88 |
| 5 | 260 |
| 6 | 15192960 |
| 7 | 28 |
| 8 | 61616 |
| 9 | 9 |
| 10 | 7888549122400 |
| 11 | 55 |
| 12 | 182208 |
| 13 | 132538588 |
| 14 | 2240 |
| 15 | 165 |
| 16 | 32048741728 |
| 17 | 1185506696 |
| 18 | 2194329698227926780769440 |
| 19 | 247 |
| 20 | 23264534699960 |
| 21 | 69737318935284 |
| 22 | 179872 |
| 23 | 14559920 |
| 24 | 16912071582760464 |
| 25 | 130885300 |
| 26 | 69521680967024 |
| 27 | 27 |