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 | -3 |
| 3 | 6 |
| 4 | 1 |
| 5 | -20 |
| 6 | 24 |
| 7 | 38 |
| 8 | -132 |
| 9 | 34 |
| 10 | 411 |
| 11 | -632 |
| 12 | -601 |
| 13 | 2914 |
| 14 | -1664 |
| 15 | -7822 |
| 16 | 15649 |
| 17 | 6802 |
| 18 | -62082 |
| 19 | 55672 |
| 20 | 141109 |
| 21 | -369310 |
| 22 | -12036 |
| 23 | 1275642 |
| 24 | -1580834 |
| 25 | -2343886 |
| 26 | 8375349 |
| 27 | -2648282 |
| 28 | -25217490 |
| 29 | 41097852 |
| 30 | 33815048 |
| 31 | -183252284 |
| 32 | 117569579 |
| 33 | 475949186 |
| 34 | -1006346968 |
| 35 | -344955964 |