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) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 112 |
| 3 | 1760 |
| 4 | 29120 |
| 5 | 496128 |
| 6 | 8614144 |
| 7 | 151557120 |
| 8 | 2692684800 |
| 9 | 48201359360 |
| 10 | 868004380672 |
| 11 | 15706806542336 |
| 12 | 285362317180928 |
| 13 | 5202031080243200 |
| 14 | 95104728494899200 |
| 15 | 1743063914667048960 |
| 16 | 32016101348447354880 |
| 17 | 589188508080622534656 |
| 18 | 10861173739509105295360 |