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 | -1 |
| 3 | 1 |
| 4 | -11 |
| 5 | 1 |
| 6 | 1 |
| 7 | -25 |
| 8 | 70 |
| 9 | -1 |
| 10 | 1 |
| 11 | -39 |
| 12 | 335 |
| 13 | -354 |
| 14 | 1 |
| 15 | 1 |
| 16 | -53 |
| 17 | 796 |
| 18 | -3243 |
| 19 | 1599 |
| 20 | -1 |
| 21 | 1 |
| 22 | -67 |
| 23 | 1453 |
| 24 | -11396 |
| 25 | 25654 |
| 26 | -6813 |
| 27 | 1 |
| 28 | 1 |
| 29 | -81 |
| 30 | 2306 |
| 31 | -27557 |
| 32 | 129202 |
| 33 | -177146 |
| 34 | 28156 |
| 35 | -1 |
| 36 | 1 |
| 37 | -95 |
| 38 | 3355 |
| 39 | -54470 |
| 40 | 407695 |
| 41 | -1239902 |
| 42 | 1111042 |
| 43 | -114524 |