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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 0 |
| 5 | 2 |
| 6 | 0 |
| 7 | 1 |
| 8 | 2 |
| 9 | -1 |
| 10 | 3 |
| 11 | 0 |
| 12 | 0 |
| 13 | 4 |
| 14 | -3 |
| 15 | 4 |
| 16 | 1 |
| 17 | -3 |
| 18 | 8 |
| 19 | -6 |
| 20 | 4 |
| 21 | 5 |
| 22 | -10 |
| 23 | 15 |
| 24 | -9 |
| 25 | 0 |
| 26 | 16 |
| 27 | -24 |
| 28 | 25 |
| 29 | -8 |
| 30 | -15 |
| 31 | 41 |
| 32 | -48 |
| 33 | 34 |
| 34 | 8 |
| 35 | -55 |
| 36 | 90 |
| 37 | -81 |
| 38 | 27 |
| 39 | 64 |
| 40 | -144 |
| 41 | 172 |
| 42 | -107 |
| 43 | -36 |
| 44 | 209 |
| 45 | -315 |
| 46 | 280 |
| 47 | -70 |
| 48 | -244 |
| 49 | 525 |
| 50 | -594 |
| 51 | 351 |
| 52 | 175 |
| 53 | -768 |
| 54 | 1120 |
| 55 | -944 |
| 56 | 177 |
| 57 | 944 |
| 58 | -1887 |
| 59 | 2065 |
| 60 | -1120 |
| 61 | -766 |
| 62 | 2832 |
| 63 | -3951 |
| 64 | 3186 |
| 65 | -353 |
| 66 | -3597 |
| 67 | 6784 |
| 68 | -7136 |