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 | -15 |
| 1 | 45 |
| 2 | -633 |
| 3 | -12321 |
| 4 | -212379 |
| 5 | -3867255 |
| 6 | -68998575 |
| 7 | -1240820397 |
| 8 | -22247101689 |
| 9 | -399334774401 |
| 10 | -7164902653275 |
| 11 | -128574917201655 |
| 12 | -2307142450214223 |
| 13 | -41400271270803501 |
| 14 | -742895806968482169 |
| 15 | -13330737506206610145 |
| 16 | -239210288473732159515 |