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 | -2 |
| 2 | -14 |
| 3 | -140 |
| 4 | -1610 |
| 5 | -19964 |
| 6 | -259532 |
| 7 | -3485144 |
| 8 | -47920730 |
| 9 | -670890220 |
| 10 | -9526641124 |
| 11 | -136837208872 |
| 12 | -1984139528644 |
| 13 | -28998962341720 |
| 14 | -426699017313880 |
| 15 | -6315145456245424 |
| 16 | -93937788661650682 |
| 17 | -1403541077650545484 |
| 18 | -21053116164758182260 |
| 19 | -316904801216886322440 |