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 | -7 |
| 2 | -14 |
| 3 | 854 |
| 4 | 7000 |
| 5 | -405832 |
| 6 | -7373744 |
| 7 | 396878384 |
| 8 | 13211201920 |
| 9 | -640085041792 |
| 10 | -35826474785024 |
| 11 | 1495566369860864 |
| 12 | 136414677606538240 |
| 13 | -4577281372443415552 |
| 14 | -691769416923579029504 |
| 15 | 16372660554702059116544 |