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) |
|---|---|
| 2 | 1 |
| 3 | -1 |
| 4 | -1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 0 |
| 9 | -1 |
| 10 | -2 |
| 11 | -2 |
| 12 | -1 |
| 13 | -1 |
| 14 | 0 |
| 15 | 2 |
| 16 | 4 |
| 17 | 4 |
| 18 | 5 |
| 19 | 5 |
| 20 | 5 |
| 21 | 2 |
| 22 | 1 |
| 23 | -2 |
| 24 | -5 |
| 25 | -8 |
| 26 | -11 |
| 27 | -14 |
| 28 | -17 |
| 29 | -18 |
| 30 | -20 |
| 31 | -18 |
| 32 | -18 |
| 33 | -11 |
| 34 | -9 |
| 35 | -1 |
| 36 | 4 |
| 37 | 15 |
| 38 | 22 |
| 39 | 34 |
| 40 | 41 |
| 41 | 54 |
| 42 | 61 |
| 43 | 70 |
| 44 | 77 |
| 45 | 83 |
| 46 | 87 |
| 47 | 87 |
| 48 | 86 |
| 49 | 80 |
| 50 | 76 |
| 51 | 59 |
| 52 | 50 |
| 53 | 27 |
| 54 | 11 |
| 55 | -19 |
| 56 | -39 |
| 57 | -78 |
| 58 | -100 |
| 59 | -143 |
| 60 | -170 |
| 61 | -216 |
| 62 | -243 |
| 63 | -290 |
| 64 | -316 |