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 | 168 |
| 2 | -13608 |
| 3 | 210336 |
| 4 | 1805496 |
| 5 | -22562064 |
| 6 | -322437024 |
| 7 | -2063087808 |
| 8 | -9165872520 |
| 9 | -32250917496 |
| 10 | -96383477232 |
| 11 | -254377990944 |
| 12 | -608736541728 |
| 13 | -1346209592784 |
| 14 | -2786771573568 |
| 15 | -5459635814976 |
| 16 | -10197462567432 |
| 17 | -18283324047408 |
| 18 | -31620880746504 |