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 | -36 |
| 2 | 1410 |
| 3 | -66132 |
| 4 | 3699531 |
| 5 | -243652552 |
| 6 | 18663547812 |
| 7 | -1645181597880 |
| 8 | 165358218423381 |
| 9 | -18798313917019868 |
| 10 | 2399880945858805926 |
| 11 | -341881241933228090220 |
| 12 | 54038106872826560500575 |
| 13 | -9428302924156701986153760 |
| 14 | 1807402648330738178213456072 |