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 | 1 |
| 3 | -2 |
| 4 | -80 |
| 5 | -75 |
| 6 | 15545 |
| 7 | 15538 |
| 8 | -5749256 |
| 9 | -5749247 |
| 10 | 3481035145 |
| 11 | 3481035134 |
| 12 | -3134947341576 |
| 13 | -3134947341563 |
| 14 | 3934241438357713 |
| 15 | 3934241438357698 |
| 16 | -6564474114274532912 |
| 17 | -6564474114274532895 |
| 18 | 14056519977953450458097 |
| 19 | 14056519977953450458078 |