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 | -3 |
| 3 | -29 |
| 4 | -499 |
| 5 | -13101 |
| 6 | -486131 |
| 7 | -24266797 |
| 8 | -1571357619 |
| 9 | -128264296301 |
| 10 | -12894743113075 |
| 11 | -1566235727656365 |
| 12 | -226180775756251955 |
| 13 | -38308065207361046509 |
| 14 | -7521255169156107737331 |
| 15 | -1694604321825062440852013 |
| 16 | -434302821056087233474158259 |