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 | 0 |
| 4 | -2 |
| 5 | 0 |
| 6 | -7 |
| 7 | 0 |
| 8 | -6 |
| 9 | -6 |
| 10 | -13 |
| 11 | 0 |
| 12 | -13 |
| 13 | 0 |
| 14 | -19 |
| 15 | -22 |
| 16 | -22 |
| 17 | 0 |
| 18 | -19 |
| 19 | 0 |
| 20 | -23 |
| 21 | -32 |
| 22 | -31 |
| 23 | 0 |
| 24 | -81 |
| 25 | -20 |
| 26 | -37 |
| 27 | -24 |
| 28 | -33 |
| 29 | 0 |
| 30 | -21 |
| 31 | 0 |
| 32 | -78 |
| 33 | -52 |
| 34 | -49 |
| 35 | -58 |
| 36 | -183 |
| 37 | 0 |
| 38 | -55 |
| 39 | -62 |
| 40 | -147 |
| 41 | 0 |
| 42 | -29 |
| 43 | 0 |
| 44 | -53 |
| 45 | -52 |
| 46 | -67 |
| 47 | 0 |
| 48 | -321 |
| 49 | -42 |
| 50 | -53 |
| 51 | -82 |
| 52 | -63 |
| 53 | 0 |
| 54 | -223 |
| 55 | -94 |
| 56 | -213 |
| 57 | -92 |
| 58 | -85 |
| 59 | 0 |
| 60 | -591 |
| 61 | 0 |
| 62 | -91 |
| 63 | -74 |
| 64 | -278 |
| 65 | -112 |
| 66 | -45 |
| 67 | 0 |
| 68 | -83 |
| 69 | -112 |
| 70 | -45 |
| 71 | 0 |
| 72 | -733 |