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 | 2 |
| 2 | 7 |
| 3 | 37 |
| 4 | 241 |
| 5 | 1801 |
| 6 | 15121 |
| 7 | 141121 |
| 8 | 1451521 |
| 9 | 16329601 |
| 10 | 199584001 |
| 11 | 37362124801 |
| 12 | 566658892801 |
| 13 | 9153720576001 |
| 14 | 23112569077678080001 |
| 15 | 186134520519971831808000001 |