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 | -20 |
| 2 | 170 |
| 3 | -760 |
| 4 | 1615 |
| 5 | 476 |
| 6 | -11210 |
| 7 | 22440 |
| 8 | 1615 |
| 9 | -64600 |
| 10 | 60002 |
| 11 | 51680 |
| 12 | -9520 |
| 13 | -213180 |
| 14 | -83980 |
| 15 | 803528 |
| 16 | -379525 |
| 17 | -692360 |
| 18 | 119700 |
| 19 | 80920 |
| 20 | 1899830 |
| 21 | -1235360 |
| 22 | -755990 |
| 23 | -1200040 |
| 24 | -1981435 |
| 25 | 8388956 |
| 26 | -361760 |
| 27 | -5068440 |