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 | 98 |
| 3 | -68612 |
| 4 | -2643860 |
| 5 | 200474744 |
| 6 | 20802160696 |
| 7 | -565340211248 |
| 8 | -173282369297008 |
| 9 | -1106561008095200 |
| 10 | 1612371646170873376 |
| 11 | 66528051435456910784 |
| 12 | -16502827469331089383232 |
| 13 | -1405736274981817978343552 |
| 14 | 179184855663797992113292160 |
| 15 | 26914050797599819627076625664 |