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 | -1 |
| 5 | 1 |
| 6 | 6 |
| 7 | -6 |
| 8 | 2 |
| 9 | -5 |
| 10 | 8 |
| 11 | -3 |
| 12 | 1 |
| 13 | -2 |
| 14 | 1 |
| 15 | 24 |
| 16 | -36 |
| 17 | 24 |
| 18 | -6 |
| 19 | -26 |
| 20 | 57 |
| 21 | -42 |
| 22 | 11 |
| 23 | 9 |
| 24 | -24 |
| 25 | 21 |
| 26 | -6 |
| 27 | -1 |
| 28 | 3 |
| 29 | -3 |
| 30 | 1 |
| 31 | 120 |
| 32 | -240 |
| 33 | 240 |
| 34 | -120 |
| 35 | 24 |
| 36 | -154 |
| 37 | 428 |
| 38 | -468 |
| 39 | 244 |
| 40 | -50 |
| 41 | 71 |
| 42 | -236 |
| 43 | 294 |
| 44 | -164 |
| 45 | 35 |
| 46 | -14 |
| 47 | 52 |
| 48 | -72 |
| 49 | 44 |
| 50 | -10 |
| 51 | 1 |
| 52 | -4 |
| 53 | 6 |
| 54 | -4 |
| 55 | 1 |
| 56 | 720 |
| 57 | -1800 |
| 58 | 2400 |
| 59 | -1800 |
| 60 | 720 |
| 61 | -120 |
| 62 | -1044 |
| 63 | 3510 |
| 64 | -5080 |
| 65 | 3960 |
| 66 | -1620 |
| 67 | 274 |
| 68 | 580 |
| 69 | -2305 |
| 70 | 3720 |
| 71 | -3070 |
| 72 | 1300 |
| 73 | -225 |
| 74 | -155 |
| 75 | 685 |
| 76 | -1210 |
| 77 | 1070 |
| 78 | -475 |
| 79 | 85 |
| 80 | 20 |
| 81 | -95 |
| 82 | 180 |
| 83 | -170 |
| 84 | 80 |
| 85 | -15 |
| 86 | -1 |
| 87 | 5 |
| 88 | -10 |
| 89 | 10 |
| 90 | -5 |
| 91 | 1 |