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 | 3 |
| 1 | -16 |
| 2 | 111 |
| 3 | -2548 |
| 4 | 14385 |
| 5 | -672360 |
| 6 | 10351845 |
| 7 | -270594968 |
| 8 | 2631486186 |
| 9 | -310710613080 |
| 10 | 3648232023975 |
| 11 | -604596371658444 |
| 12 | 8315244191734623 |
| 13 | -122717408718016112 |
| 14 | 3868618892876082345 |
| 15 | -1102643727493413977872 |
| 16 | 19593301788429800483052 |
| 17 | -6988461512994426036295152 |
| 18 | 138198195880599649938536250 |