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 | 1 |
| 2 | -6 |
| 3 | -307 |
| 4 | 104742 |
| 5 | 251699498 |
| 6 | -4229811552588 |
| 7 | -497641562809372379 |
| 8 | 409828230340907182689774 |
| 9 | 2362579011761419853955236859806 |
| 10 | -95338580221916838164306067991935130836 |