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 | 8 |
| 2 | -47 |
| 3 | -1458 |
| 4 | -9823 |
| 5 | -19076 |
| 6 | 251505 |
| 7 | 3959426 |
| 8 | 40949569 |
| 9 | 382637520 |
| 10 | 3476784401 |
| 11 | 31361572438 |
| 12 | 282393704673 |
| 13 | 2541803079812 |
| 14 | 22876687041457 |
| 15 | 205890961235274 |
| 16 | 1853019920416385 |
| 17 | 16677181289327896 |
| 18 | 150094634684779089 |
| 19 | 1350851716779120350 |