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 | -1 |
| 2 | -77 |
| 3 | 239 |
| 4 | 30877 |
| 5 | -160801 |
| 6 | -30468977 |
| 7 | 222359759 |
| 8 | 56025500377 |
| 9 | -525750911041 |
| 10 | -165532771357877 |
| 11 | 1898604115708079 |
| 12 | 717305800978797877 |
| 13 | -9723130520022672481 |
| 14 | -4285693661775748922777 |
| 15 | 67030256200148854573199 |
| 16 | 33765846794176822397603377 |