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 | -4 |
| 4 | 0 |
| 5 | 5 |
| 6 | 11 |
| 7 | 4 |
| 8 | -4 |
| 9 | -13 |
| 10 | -23 |
| 11 | -12 |
| 12 | 0 |
| 13 | 13 |
| 14 | 27 |
| 15 | 42 |
| 16 | 26 |
| 17 | 9 |
| 18 | -9 |
| 19 | -28 |
| 20 | -48 |
| 21 | -69 |
| 22 | -47 |
| 23 | -24 |
| 24 | 0 |
| 25 | 25 |
| 26 | 51 |
| 27 | 78 |
| 28 | 106 |
| 29 | 77 |
| 30 | 47 |
| 31 | 16 |
| 32 | -16 |
| 33 | -49 |
| 34 | -83 |
| 35 | -118 |
| 36 | -154 |
| 37 | -117 |
| 38 | -79 |
| 39 | -40 |
| 40 | 0 |
| 41 | 41 |
| 42 | 83 |
| 43 | 126 |
| 44 | 170 |
| 45 | 215 |
| 46 | 169 |
| 47 | 122 |
| 48 | 74 |
| 49 | 25 |
| 50 | -25 |
| 51 | -76 |
| 52 | -128 |
| 53 | -181 |
| 54 | -235 |
| 55 | -290 |
| 56 | -234 |
| 57 | -177 |
| 58 | -119 |
| 59 | -60 |
| 60 | 0 |
| 61 | 61 |
| 62 | 123 |
| 63 | 186 |
| 64 | 250 |
| 65 | 315 |
| 66 | 381 |
| 67 | 314 |
| 68 | 246 |
| 69 | 177 |