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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 3 |
| 7 | -1 |
| 8 | 6 |
| 9 | -2 |
| 10 | -1 |
| 11 | 0 |
| 12 | 1 |
| 13 | 9 |
| 14 | -8 |
| 15 | 15 |
| 16 | -5 |
| 17 | -7 |
| 18 | -10 |
| 19 | 14 |
| 20 | -29 |
| 21 | 58 |
| 22 | -78 |
| 23 | 101 |
| 24 | -118 |
| 25 | 150 |
| 26 | -61 |
| 27 | 309 |
| 28 | -307 |
| 29 | 553 |
| 30 | -494 |
| 31 | -186 |
| 32 | -644 |
| 33 | 315 |
| 34 | -1177 |
| 35 | 731 |
| 36 | -1458 |
| 37 | 3480 |
| 38 | -5183 |
| 39 | 7096 |
| 40 | -8328 |
| 41 | 9735 |
| 42 | -10882 |
| 43 | 7200 |
| 44 | -29452 |
| 45 | 31322 |
| 46 | -52670 |
| 47 | 51401 |
| 48 | -65210 |
| 49 | 61001 |
| 50 | 11318 |
| 51 | 135012 |
| 52 | -109687 |
| 53 | 259226 |
| 54 | -221542 |