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 | 1 |
| 4 | 5 |
| 5 | -7 |
| 6 | -3 |
| 7 | 17 |
| 8 | -11 |
| 9 | -23 |
| 10 | 45 |
| 11 | 1 |
| 12 | -91 |
| 13 | 89 |
| 14 | 93 |
| 15 | -271 |
| 16 | 85 |
| 17 | 457 |
| 18 | -627 |
| 19 | -287 |
| 20 | 1541 |
| 21 | -967 |
| 22 | -2115 |
| 23 | 4049 |
| 24 | 181 |
| 25 | -8279 |
| 26 | 7917 |
| 27 | 8641 |
| 28 | -24475 |
| 29 | 7193 |
| 30 | 41757 |
| 31 | -56143 |
| 32 | -27371 |
| 33 | 139657 |
| 34 | -84915 |
| 35 | -194399 |
| 36 | 364229 |
| 37 | 24569 |
| 38 | -753027 |
| 39 | 703889 |
| 40 | 802165 |
| 41 | -2209943 |
| 42 | 605613 |
| 43 | 3814273 |
| 44 | -5025499 |
| 45 | -2603047 |