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 | -2 |
| 2 | 1 |
| 3 | 6 |
| 4 | -4 |
| 5 | 1 |
| 6 | -22 |
| 7 | 16 |
| 8 | -6 |
| 9 | 1 |
| 10 | 90 |
| 11 | -68 |
| 12 | 30 |
| 13 | -8 |
| 14 | 1 |
| 15 | -394 |
| 16 | 304 |
| 17 | -146 |
| 18 | 48 |
| 19 | -10 |
| 20 | 1 |
| 21 | 1806 |
| 22 | -1412 |
| 23 | 714 |
| 24 | -264 |
| 25 | 70 |
| 26 | -12 |
| 27 | 1 |
| 28 | -8558 |
| 29 | 6752 |
| 30 | -3534 |
| 31 | 1408 |
| 32 | -430 |
| 33 | 96 |
| 34 | -14 |
| 35 | 1 |
| 36 | 41586 |
| 37 | -33028 |
| 38 | 17718 |
| 39 | -7432 |
| 40 | 2490 |
| 41 | -652 |
| 42 | 126 |
| 43 | -16 |
| 44 | 1 |