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 | -3 |
| 2 | -7 |
| 3 | -39 |
| 4 | -315 |
| 5 | -3243 |
| 6 | -40167 |
| 7 | -579159 |
| 8 | -9514395 |
| 9 | -175345083 |
| 10 | -3582404487 |
| 11 | -80368306119 |
| 12 | -1964266364475 |
| 13 | -51955106653323 |
| 14 | -1478719724319207 |
| 15 | -45062796853058679 |
| 16 | -1463985729352297755 |
| 17 | -50509695778598958363 |
| 18 | -1844377821680825976327 |