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 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | -1 |
| 6 | 2 |
| 7 | 2 |
| 8 | 0 |
| 9 | -4 |
| 10 | 3 |
| 11 | -3 |
| 12 | 2 |
| 13 | 4 |
| 14 | -9 |
| 15 | 5 |
| 16 | 4 |
| 17 | -5 |
| 18 | 0 |
| 19 | 15 |
| 20 | -20 |
| 21 | 8 |
| 22 | -5 |
| 23 | 9 |
| 24 | -10 |
| 25 | -15 |
| 26 | 45 |
| 27 | -40 |
| 28 | 13 |
| 29 | 6 |
| 30 | -14 |
| 31 | 28 |
| 32 | 0 |
| 33 | -70 |
| 34 | 112 |
| 35 | -78 |
| 36 | 21 |
| 37 | -7 |
| 38 | 20 |
| 39 | -56 |
| 40 | 42 |
| 41 | 70 |
| 42 | -224 |
| 43 | 260 |
| 44 | -147 |
| 45 | 34 |
| 46 | 8 |
| 47 | -27 |
| 48 | 96 |
| 49 | -126 |
| 50 | 0 |
| 51 | 336 |
| 52 | -624 |
| 53 | 567 |
| 54 | -272 |
| 55 | 55 |
| 56 | -9 |
| 57 | 35 |
| 58 | -150 |
| 59 | 270 |
| 60 | -210 |
| 61 | -336 |
| 62 | 1170 |
| 63 | -1575 |
| 64 | 1190 |
| 65 | -495 |
| 66 | 89 |