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 | 20 |
| 3 | 1292054400 |
| 4 | 10927088640 |
| 5 | 25841088000 |
| 6 | 218541772800 |
| 7 | 346787400960 |
| 8 | 4084563974400 |
| 9 | 4422275520000 |
| 10 | 5977228233600 |
| 11 | 6935748019200 |
| 12 | 12161257680000 |
| 13 | 14165346124800 |
| 14 | 31925327616000 |
| 15 | 50340380688000 |
| 16 | 81691279488000 |
| 17 | 51671470406400 |
| 18 | 88445510400000 |