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 | 21 |
| 2 | 199 |
| 3 | -5985 |
| 4 | -270159 |
| 5 | 120141 |
| 6 | 329415351 |
| 7 | 6743277639 |
| 8 | -416420774175 |
| 9 | -21799821766779 |
| 10 | 449168189050791 |
| 11 | 62188100645671791 |
| 12 | 110264394305901969 |
| 13 | -178278691994606939715 |
| 14 | -4090744316373113328489 |
| 15 | 518102577833892931856151 |
| 16 | 25729556002946152951394241 |