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 | -22 |
| 2 | 187 |
| 3 | -638 |
| 4 | -561 |
| 5 | 10582 |
| 6 | -20460 |
| 7 | -44132 |
| 8 | 157311 |
| 9 | 154132 |
| 10 | -468666 |
| 11 | -1959718 |
| 12 | 2247421 |
| 13 | 12556104 |
| 14 | -8229859 |
| 15 | -41049558 |
| 16 | -43660639 |
| 17 | 121417780 |
| 18 | 408706870 |
| 19 | -100429384 |
| 20 | -1145215709 |
| 21 | -2659879552 |
| 22 | 853739235 |
| 23 | 13377528824 |