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 | 3 |
| 2 | -1 |
| 3 | -6 |
| 4 | 6 |
| 5 | -9 |
| 6 | -70 |
| 7 | 163 |
| 8 | -42 |
| 9 | -72 |
| 10 | 30 |
| 11 | -123 |
| 12 | -1110 |
| 13 | 8440 |
| 14 | -18244 |
| 15 | 2423 |
| 16 | 43036 |
| 17 | -53172 |
| 18 | 11232 |
| 19 | 8640 |
| 20 | 90 |
| 21 | -792 |
| 22 | -7425 |
| 23 | 137760 |
| 24 | -771911 |
| 25 | 1624514 |
| 26 | 2262109 |
| 27 | -21114844 |
| 28 | 51074797 |
| 29 | -54783526 |
| 30 | 6214788 |
| 31 | 45596664 |
| 32 | -40513824 |
| 33 | 7309440 |
| 34 | 3110400 |
| 35 | 630 |
| 36 | -10278 |
| 37 | -86841 |
| 38 | 3685605 |
| 39 | -41159454 |