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 | -195 |
| 3 | 587 |
| 4 | 190905 |
| 5 | -958441 |
| 6 | -456423435 |
| 7 | 3208393187 |
| 8 | 2031120835185 |
| 9 | -18357153435601 |
| 10 | -14521552284155475 |
| 11 | 160410736104452987 |
| 12 | 152266846748812455465 |
| 13 | -1987817374606532447161 |
| 14 | -2201371244223771530940315 |
| 15 | 33159832798775207321651987 |
| 16 | 41968251293767181816904683745 |