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 | 1 |
| 3 | -2 |
| 4 | 3 |
| 5 | -4 |
| 6 | 6 |
| 7 | -8 |
| 8 | 11 |
| 9 | -15 |
| 10 | 19 |
| 11 | -25 |
| 12 | 33 |
| 13 | -42 |
| 14 | 53 |
| 15 | -68 |
| 16 | 86 |
| 17 | -107 |
| 18 | 134 |
| 19 | -166 |
| 20 | 205 |
| 21 | -253 |
| 22 | 309 |
| 23 | -377 |
| 24 | 460 |
| 25 | -557 |
| 26 | 672 |
| 27 | -811 |
| 28 | 974 |
| 29 | -1166 |
| 30 | 1394 |
| 31 | -1661 |
| 32 | 1975 |
| 33 | -2344 |
| 34 | 2773 |
| 35 | -3275 |
| 36 | 3863 |
| 37 | -4543 |
| 38 | 5333 |
| 39 | -6253 |
| 40 | 7316 |
| 41 | -8544 |
| 42 | 9964 |
| 43 | -11600 |
| 44 | 13484 |
| 45 | -15653 |
| 46 | 18140 |