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 | 0 |
| 2 | 1 |
| 3 | -23 |
| 4 | 5 |
| 5 | 4939 |
| 6 | 11839 |
| 7 | -1110829 |
| 8 | -14470283 |
| 9 | 1684880593181 |
| 10 | 13113784231 |
| 11 | -28792751815367863 |
| 12 | -40127106428444687 |
| 13 | 97116294357644526719 |
| 14 | 15137700541235610329 |
| 15 | -17271137929251359193013081753 |
| 16 | -622005606550391960056009 |