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 | 216 |
| 3 | -3348 |
| 4 | 13888 |
| 5 | 52110 |
| 6 | -723168 |
| 7 | 2822456 |
| 8 | -4078080 |
| 9 | -3139803 |
| 10 | 11255760 |
| 11 | 20586852 |
| 12 | -46497024 |
| 13 | -190073338 |
| 14 | 609650496 |
| 15 | -174464280 |
| 16 | -1335947264 |
| 17 | 1646527986 |
| 18 | -678197448 |
| 19 | 1563257180 |
| 20 | 723703680 |
| 21 | -9449582688 |
| 22 | 4446760032 |
| 23 | 9451116072 |
| 24 | 13653411840 |
| 25 | -27802126025 |
| 26 | -41055841008 |