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 | 8 |
| 3 | 19 |
| 4 | 45 |
| 5 | -72 |
| 6 | -224 |
| 7 | -72 |
| 8 | 3465 |
| 9 | 1656 |
| 10 | -4752 |
| 11 | -31248 |
| 12 | -440 |
| 13 | 62064 |
| 14 | 415008 |
| 15 | 936432 |
| 16 | 6776793 |
| 17 | -16454232 |
| 18 | -24983784 |
| 19 | 74804904 |
| 20 | 468856296 |
| 21 | 236519784 |
| 22 | -2495390904 |
| 23 | -8714625696 |
| 24 | -8228470832 |
| 25 | 62274531168 |
| 26 | 155889061848 |
| 27 | -47291852448 |
| 28 | -1334769988176 |
| 29 | -4304113760232 |