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 | 3 |
| 1 | -15 |
| 2 | -111 |
| 3 | -1419 |
| 4 | -32847 |
| 5 | -549633 |
| 6 | -10161885 |
| 7 | -180368529 |
| 8 | -3250331151 |
| 9 | -58231071723 |
| 10 | -1045558051887 |
| 11 | -18757368165345 |
| 12 | -336617548680381 |
| 13 | -6040149618970929 |
| 14 | -108387507398297007 |
| 15 | -1944925169961946443 |
| 16 | -34900332815651650575 |
| 17 | -626260604480315081409 |