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 | 0 |
| 3 | 1 |
| 4 | -2 |
| 5 | 1 |
| 6 | -1 |
| 7 | 1 |
| 8 | -7 |
| 9 | 10 |
| 10 | 0 |
| 11 | 4 |
| 12 | -31 |
| 13 | 31 |
| 14 | 8 |
| 15 | 53 |
| 16 | -163 |
| 17 | 108 |
| 18 | -74 |
| 19 | 212 |
| 20 | -450 |
| 21 | 732 |
| 22 | -353 |
| 23 | 467 |
| 24 | -3412 |
| 25 | 3614 |
| 26 | -145 |
| 27 | 5613 |
| 28 | -11910 |
| 29 | 8816 |
| 30 | -13354 |
| 31 | 21558 |
| 32 | -44624 |
| 33 | 77598 |
| 34 | -43860 |
| 35 | 67721 |
| 36 | -255791 |
| 37 | 261710 |
| 38 | -127452 |
| 39 | 529648 |
| 40 | -1118393 |
| 41 | 997295 |
| 42 | -1206756 |
| 43 | 2184148 |
| 44 | -3314638 |
| 45 | 5934992 |
| 46 | -5394856 |