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 | -600 |
| 2 | 34920 |
| 3 | -157920 |
| 4 | -23913240 |
| 5 | 297457776 |
| 6 | 3581091360 |
| 7 | -13666238400 |
| 8 | -458367407640 |
| 9 | -4230394757880 |
| 10 | -25457298127632 |
| 11 | -118465178148000 |
| 12 | -459399324219360 |
| 13 | -1550209298287440 |
| 14 | -4682236500918720 |
| 15 | -12910757263315776 |
| 16 | -32979872278342680 |
| 17 | -78921341989665840 |
| 18 | -178491991660958520 |