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 | -17 |
| 2 | 136 |
| 3 | -697 |
| 4 | 2669 |
| 5 | -8517 |
| 6 | 24361 |
| 7 | -64549 |
| 8 | 160140 |
| 9 | -375564 |
| 10 | 842078 |
| 11 | -1818932 |
| 12 | 3800537 |
| 13 | -7709449 |
| 14 | 15239497 |
| 15 | -29440226 |
| 16 | 55697542 |
| 17 | -103382254 |
| 18 | 188589925 |
| 19 | -338602243 |
| 20 | 599066162 |
| 21 | -1045509435 |
| 22 | 1801660255 |
| 23 | -3068201310 |