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) |
|---|---|
| 1 | 1 |
| 2 | -3 |
| 3 | 1 |
| 4 | 15 |
| 5 | -9 |
| 6 | 1 |
| 7 | -105 |
| 8 | 87 |
| 9 | -18 |
| 10 | 1 |
| 11 | 947 |
| 12 | -975 |
| 13 | 285 |
| 14 | -30 |
| 15 | 1 |
| 16 | -10472 |
| 17 | 12657 |
| 18 | -4680 |
| 19 | 705 |
| 20 | -45 |
| 21 | 1 |
| 22 | 137337 |
| 23 | -188090 |
| 24 | 82887 |
| 25 | -15960 |
| 26 | 1470 |
| 27 | -63 |
| 28 | 1 |
| 29 | -2085605 |
| 30 | 3159699 |
| 31 | -1598954 |
| 32 | 370237 |
| 33 | -43890 |
| 34 | 2730 |
| 35 | -84 |
| 36 | 1 |
| 37 | 36017472 |
| 38 | -59326371 |
| 39 | 33613353 |
| 40 | -9009294 |
| 41 | 1292067 |
| 42 | -103950 |
| 43 | 4662 |
| 44 | -108 |
| 45 | 1 |