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 | 2 |
| 3 | 6 |
| 4 | 16 |
| 5 | 60 |
| 6 | 144 |
| 7 | 756 |
| 8 | 2048 |
| 9 | 7776 |
| 10 | 24000 |
| 11 | 120032 |
| 12 | 276480 |
| 13 | 1719900 |
| 14 | 4741632 |
| 15 | 17820000 |
| 16 | 67108864 |
| 17 | 336849900 |
| 18 | 725594112 |
| 19 | 4822382628 |
| 20 | 11842560000 |
| 21 | 57802864896 |
| 22 | 200778006528 |
| 23 | 998132265920 |
| 24 | 2283043553280 |
| 25 | 13122000000000 |
| 26 | 44980696051200 |
| 27 | 178118842613760 |