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 | 34 |
| 2 | 274 |
| 3 | -50660 |
| 4 | -2447444 |
| 5 | 95515384 |
| 6 | 14040751096 |
| 7 | -28081874864 |
| 8 | -87642381012080 |
| 9 | -2781695245370336 |
| 10 | 601127582131299616 |
| 11 | 44972889856630550464 |
| 12 | -4303061546712430158656 |
| 13 | -622297158830800371505280 |
| 14 | 28180800294357511567970176 |
| 15 | 8642272527250878380658183424 |