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 | -4 |
| 2 | -11 |
| 3 | -104 |
| 4 | -1388 |
| 5 | -22980 |
| 6 | -446524 |
| 7 | -9882944 |
| 8 | -244592124 |
| 9 | -6684031040 |
| 10 | -199824449532 |
| 11 | -6488250797312 |
| 12 | -227456440349948 |
| 13 | -8565880619584896 |
| 14 | -345018776767586572 |
| 15 | -14805421633750610240 |
| 16 | -674514253891722861612 |
| 17 | -32522567276377571337728 |