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 | 5 |
| 3 | 46 |
| 4 | 598 |
| 5 | 10056 |
| 6 | 207960 |
| 7 | 5111856 |
| 8 | 145721520 |
| 9 | 4728528000 |
| 10 | 172134253440 |
| 11 | 6948393580800 |
| 12 | 308058678385920 |
| 13 | 14882061698380800 |
| 14 | 778136819786726400 |
| 15 | 43783908789625804800 |
| 16 | 2638014817853286144000 |
| 17 | 169455373956672285081600 |