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 | 12 |
| 3 | -73 |
| 4 | 675 |
| 5 | -9048 |
| 6 | 166901 |
| 7 | -4058703 |
| 8 | 125837748 |
| 9 | -4845013765 |
| 10 | 226796981895 |
| 11 | -12684595018992 |
| 12 | 835391818484873 |
| 13 | -63990023222817531 |
| 14 | 5640684058036591260 |
| 15 | -566948619030797914657 |
| 16 | 64452061572236327204235 |
| 17 | -8228252550026752605862344 |