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 | 5 |
| 3 | -44 |
| 4 | -563 |
| 5 | 9584 |
| 6 | 205937 |
| 7 | -5390272 |
| 8 | -167398247 |
| 9 | 6042477824 |
| 10 | 249317139869 |
| 11 | -11597205023744 |
| 12 | -601139006326619 |
| 13 | 34383289858207744 |
| 14 | 2151954708695291177 |
| 15 | -146323302326154543104 |
| 16 | -10742330662077208945103 |
| 17 | 846940331265064719417344 |
| 18 | 71373256668946058057974997 |