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 | -2 |
| 3 | 1 |
| 4 | 0 |
| 5 | -2 |
| 6 | 1 |
| 7 | 0 |
| 8 | 2 |
| 9 | -3 |
| 10 | 1 |
| 11 | 0 |
| 12 | -4 |
| 13 | 6 |
| 14 | -4 |
| 15 | 1 |
| 16 | 0 |
| 17 | 6 |
| 18 | -11 |
| 19 | 10 |
| 20 | -5 |
| 21 | 1 |
| 22 | 0 |
| 23 | -6 |
| 24 | 15 |
| 25 | -20 |
| 26 | 15 |
| 27 | -6 |
| 28 | 1 |
| 29 | 0 |
| 30 | 4 |
| 31 | -18 |
| 32 | 34 |
| 33 | -35 |
| 34 | 21 |
| 35 | -7 |
| 36 | 1 |
| 37 | 0 |
| 38 | -6 |
| 39 | 27 |
| 40 | -56 |
| 41 | 70 |
| 42 | -56 |
| 43 | 28 |
| 44 | -8 |
| 45 | 1 |
| 46 | 0 |
| 47 | 12 |
| 48 | -42 |
| 49 | 88 |
| 50 | -127 |
| 51 | 126 |
| 52 | -84 |
| 53 | 36 |
| 54 | -9 |
| 55 | 1 |
| 56 | 0 |
| 57 | -10 |
| 58 | 45 |
| 59 | -120 |
| 60 | 210 |
| 61 | -252 |
| 62 | 210 |
| 63 | -120 |
| 64 | 45 |
| 65 | -10 |
| 66 | 1 |
| 67 | 0 |
| 68 | 4 |
| 69 | -42 |
| 70 | 154 |
| 71 | -325 |
| 72 | 461 |
| 73 | -462 |
| 74 | 330 |
| 75 | -165 |
| 76 | 55 |
| 77 | -11 |
| 78 | 1 |