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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | -2186 |
| 4 | 1 |
| 5 | 78126 |
| 6 | -2186 |
| 7 | -823542 |
| 8 | 1 |
| 9 | 4780783 |
| 10 | 78126 |
| 11 | -19487170 |
| 12 | -2186 |
| 13 | 62748518 |
| 14 | -823542 |
| 15 | -170783436 |
| 16 | 1 |
| 17 | 410338674 |
| 18 | 4780783 |
| 19 | -893871738 |
| 20 | 78126 |
| 21 | 1800262812 |
| 22 | -19487170 |
| 23 | -3404825446 |
| 24 | -2186 |
| 25 | 6103593751 |
| 26 | 62748518 |
| 27 | -10455572420 |
| 28 | -823542 |