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 | -119 |
| 3 | -1125 |
| 4 | 42321 |
| 5 | 702963 |
| 6 | -24976551 |
| 7 | -614805237 |
| 8 | 20534573985 |
| 9 | 691164284643 |
| 10 | -21582336376791 |
| 11 | -949437293473413 |
| 12 | 27539617738101489 |
| 13 | 1540954535989466835 |
| 14 | -41203060308232477191 |
| 15 | -2884999709417821999893 |
| 16 | 70454876663552890207041 |