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 | 3 |
| 4 | 5 |
| 5 | 25 |
| 6 | 9 |
| 7 | 721 |
| 8 | 110 |
| 9 | 2243 |
| 10 | 215 |
| 11 | 3628801 |
| 12 | 397 |
| 13 | 479001601 |
| 14 | 20027 |
| 15 | 896923 |
| 16 | 2027135 |
| 17 | 20922789888001 |
| 18 | 87334 |
| 19 | 6402373705728001 |
| 20 | 8729939 |
| 21 | 47297536723 |
| 22 | 1253566127 |
| 23 | 1124000727777607680001 |
| 24 | 37182647 |
| 25 | 41363226782215962649 |
| 26 | 608621584727 |
| 27 | 1524503639859202243 |