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 | 1 |
| 5 | -1 |
| 6 | 1 |
| 7 | -1 |
| 8 | 3 |
| 9 | -3 |
| 10 | 2 |
| 11 | -3 |
| 12 | 4 |
| 13 | -4 |
| 14 | 4 |
| 15 | -5 |
| 16 | 8 |
| 17 | -8 |
| 18 | 7 |
| 19 | -9 |
| 20 | 11 |
| 21 | -12 |
| 22 | 12 |
| 23 | -14 |
| 24 | 20 |
| 25 | -21 |
| 26 | 19 |
| 27 | -24 |
| 28 | 28 |
| 29 | -30 |
| 30 | 31 |
| 31 | -35 |
| 32 | 45 |
| 33 | -48 |
| 34 | 47 |
| 35 | -55 |
| 36 | 64 |
| 37 | -68 |
| 38 | 71 |
| 39 | -80 |
| 40 | 97 |
| 41 | -103 |
| 42 | 104 |
| 43 | -119 |
| 44 | 135 |
| 45 | -145 |
| 46 | 152 |
| 47 | -168 |
| 48 | 198 |
| 49 | -211 |
| 50 | 216 |
| 51 | -243 |
| 52 | 272 |
| 53 | -291 |
| 54 | 307 |
| 55 | -337 |
| 56 | 386 |
| 57 | -412 |