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 | -1020 |
| 3 | -59041 |
| 4 | -1048560 |
| 5 | -9765593 |
| 6 | -60466112 |
| 7 | -282475121 |
| 8 | -1073741568 |
| 9 | -3486783889 |
| 10 | -9999998976 |
| 11 | -25937422553 |
| 12 | -61917360128 |
| 13 | -137858483657 |
| 14 | -289254638592 |
| 15 | -576650357857 |
| 16 | -1099511562240 |
| 17 | -2015993769377 |