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 | -1272 |
| 2 | 351432 |
| 3 | 89559456 |
| 4 | -28689603384 |
| 5 | -3415837464144 |
| 6 | -155926897275744 |
| 7 | -3967939206760128 |
| 8 | -65540990858009400 |
| 9 | -777517458842153496 |
| 10 | -7105797244669716432 |
| 11 | -52584588767807410464 |
| 12 | -326903749149928526688 |
| 13 | -1755591468945924647184 |