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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 0 |
| 4 | -2 |
| 5 | 1 |
| 6 | -3 |
| 7 | 1 |
| 8 | -4 |
| 9 | 4 |
| 10 | -6 |
| 11 | 2 |
| 12 | -7 |
| 13 | 8 |
| 14 | -8 |
| 15 | 5 |
| 16 | -13 |
| 17 | 13 |
| 18 | -14 |
| 19 | 9 |
| 20 | -15 |
| 21 | 19 |
| 22 | -21 |
| 23 | 12 |
| 24 | -22 |
| 25 | 32 |
| 26 | -26 |
| 27 | 18 |
| 28 | -36 |
| 29 | 33 |
| 30 | -37 |
| 31 | 31 |
| 32 | -38 |
| 33 | 57 |
| 34 | -48 |
| 35 | 32 |
| 36 | -56 |
| 37 | 66 |
| 38 | -57 |
| 39 | 44 |
| 40 | -74 |
| 41 | 83 |
| 42 | -75 |
| 43 | 65 |
| 44 | -76 |
| 45 | 100 |
| 46 | -102 |
| 47 | 68 |
| 48 | -103 |
| 49 | 140 |
| 50 | -108 |
| 51 | 94 |
| 52 | -136 |
| 53 | 140 |
| 54 | -137 |
| 55 | 119 |
| 56 | -149 |
| 57 | 193 |
| 58 | -174 |
| 59 | 125 |
| 60 | -175 |
| 61 | 228 |
| 62 | -176 |
| 63 | 161 |
| 64 | -224 |
| 65 | 256 |