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 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 2 |
| 6 | -17 |
| 7 | -105 |
| 8 | -302 |
| 9 | -323 |
| 10 | 2735 |
| 11 | 21318 |
| 12 | 74513 |
| 13 | 5345 |
| 14 | -1876118 |
| 15 | -13036317 |
| 16 | -35542499 |
| 17 | 183591298 |
| 18 | 2771934527 |
| 19 | 14515620855 |
| 20 | -4104116566 |
| 21 | -739297426531 |
| 22 | -6244977674825 |
| 23 | -14587702161978 |
| 24 | 240078040966369 |
| 25 | 3207383844181633 |
| 26 | 14652985540658834 |
| 27 | -87474514259307453 |
| 28 | -2013684557381588299 |