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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 0 |
| 16 | 1 |
| 17 | -1 |
| 18 | 2 |
| 19 | -3 |
| 20 | 5 |
| 21 | -7 |
| 22 | 11 |
| 23 | -15 |
| 24 | 22 |
| 25 | -30 |
| 26 | 41 |
| 27 | -55 |
| 28 | 74 |
| 29 | -97 |
| 30 | 127 |
| 31 | -165 |
| 32 | 212 |
| 33 | -271 |
| 34 | 344 |
| 35 | -434 |
| 36 | 544 |
| 37 | -680 |
| 38 | 843 |
| 39 | -1043 |
| 40 | 1283 |
| 41 | -1573 |
| 42 | 1919 |
| 43 | -2336 |
| 44 | 2829 |
| 45 | -3419 |
| 46 | 4116 |
| 47 | -4942 |
| 48 | 5914 |
| 49 | -7062 |
| 50 | 8405 |
| 51 | -9983 |
| 52 | 11825 |
| 53 | -13976 |
| 54 | 16479 |
| 55 | -19392 |
| 56 | 22767 |