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 | -2 |
| 6 | 1 |
| 7 | -2 |
| 8 | 4 |
| 9 | -3 |
| 10 | 2 |
| 11 | -4 |
| 12 | 7 |
| 13 | -6 |
| 14 | 4 |
| 15 | -8 |
| 16 | 12 |
| 17 | -10 |
| 18 | 9 |
| 19 | -14 |
| 20 | 20 |
| 21 | -18 |
| 22 | 16 |
| 23 | -24 |
| 24 | 32 |
| 25 | -29 |
| 26 | 27 |
| 27 | -38 |
| 28 | 49 |
| 29 | -46 |
| 30 | 43 |
| 31 | -59 |
| 32 | 74 |
| 33 | -71 |
| 34 | 69 |
| 35 | -90 |
| 36 | 112 |
| 37 | -107 |
| 38 | 106 |
| 39 | -136 |
| 40 | 164 |
| 41 | -160 |
| 42 | 159 |
| 43 | -199 |
| 44 | 238 |
| 45 | -232 |
| 46 | 234 |
| 47 | -288 |
| 48 | 338 |
| 49 | -333 |
| 50 | 338 |
| 51 | -412 |
| 52 | 477 |
| 53 | -473 |
| 54 | 485 |
| 55 | -582 |
| 56 | 667 |
| 57 | -666 |
| 58 | 686 |
| 59 | -813 |
| 60 | 923 |