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 | -294 |
| 2 | -40572 |
| 3 | -9456216 |
| 4 | -3013531458 |
| 5 | -1095736644072 |
| 6 | -430427492908056 |
| 7 | -177966281438573376 |
| 8 | -76323096421188881292 |
| 9 | -33643171872410204427918 |
| 10 | -15150435131179232328586968 |
| 11 | -6940567145625149028384495432 |