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 | 0 |
| 4 | -1 |
| 5 | 1 |
| 6 | 0 |
| 7 | -2 |
| 8 | 3 |
| 9 | -1 |
| 10 | -3 |
| 11 | 6 |
| 12 | -4 |
| 13 | -4 |
| 14 | 12 |
| 15 | -10 |
| 16 | -5 |
| 17 | 23 |
| 18 | -25 |
| 19 | -2 |
| 20 | 43 |
| 21 | -57 |
| 22 | 12 |
| 23 | 74 |
| 24 | -124 |
| 25 | 56 |
| 26 | 120 |
| 27 | -258 |
| 28 | 172 |
| 29 | 170 |
| 30 | -516 |
| 31 | 454 |
| 32 | 187 |
| 33 | -989 |
| 34 | 1095 |
| 35 | 40 |
| 36 | -1811 |
| 37 | 2487 |
| 38 | -604 |
| 39 | -3128 |
| 40 | 5375 |
| 41 | -2567 |
| 42 | -4991 |
| 43 | 11140 |
| 44 | -7704 |
| 45 | -6976 |
| 46 | 22164 |
| 47 | -20062 |
| 48 | -7220 |
| 49 | 42288 |
| 50 | -48020 |
| 51 | -36 |
| 52 | 76928 |
| 53 | -108334 |
| 54 | 29476 |
| 55 | 131898 |
| 56 | -233020 |
| 57 | 117166 |