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 | -22 |
| 2 | 198 |
| 3 | -924 |
| 4 | 2310 |
| 5 | -2772 |
| 6 | 924 |
| 7 | 264 |
| 8 | 198 |
| 9 | 220 |
| 10 | 308 |
| 11 | 504 |
| 12 | 924 |
| 13 | 1848 |
| 14 | 3960 |
| 15 | 8976 |
| 16 | 21318 |
| 17 | 52668 |
| 18 | 134596 |
| 19 | 354200 |
| 20 | 956340 |
| 21 | 2641320 |
| 22 | 7443720 |
| 23 | 21360240 |
| 24 | 62300700 |
| 25 | 184410072 |
| 26 | 553230216 |
| 27 | 1680180656 |
| 28 | 5160554872 |
| 29 | 16015515120 |
| 30 | 50181947376 |
| 31 | 158639704608 |
| 32 | 505664058438 |