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 | -12 |
| 3 | 157 |
| 4 | -2040 |
| 5 | 26521 |
| 6 | -344772 |
| 7 | 4482037 |
| 8 | -58266480 |
| 9 | 757464241 |
| 10 | -9847035132 |
| 11 | 128011456717 |
| 12 | -1664148937320 |
| 13 | 21633936185161 |
| 14 | -281241170407092 |
| 15 | 3656135215292197 |
| 16 | -47529757798798560 |
| 17 | 617886851384381281 |