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 | 6 |
| 4 | 1 |
| 5 | 20 |
| 6 | 0 |
| 7 | 42 |
| 8 | 0 |
| 9 | 10 |
| 10 | 22 |
| 11 | 110 |
| 12 | -16 |
| 13 | 156 |
| 14 | 60 |
| 15 | 96 |
| 16 | -1 |
| 17 | 272 |
| 18 | -15 |
| 19 | 342 |
| 20 | -12 |
| 21 | 220 |
| 22 | 184 |
| 23 | 506 |
| 24 | -12 |
| 25 | 76 |
| 26 | 270 |
| 27 | 14 |
| 28 | 0 |
| 29 | 812 |
| 30 | -492 |
| 31 | 930 |
| 32 | -2 |
| 33 | 612 |
| 34 | 490 |
| 35 | 792 |
| 36 | -38 |
| 37 | 1332 |
| 38 | 624 |
| 39 | 880 |
| 40 | -10 |
| 41 | 1640 |
| 42 | -660 |
| 43 | 1806 |
| 44 | 48 |
| 45 | 132 |
| 46 | 940 |
| 47 | 2162 |
| 48 | 56 |
| 49 | 246 |
| 50 | 63 |
| 51 | 1560 |
| 52 | 84 |
| 53 | 2756 |
| 54 | -36 |
| 55 | 2128 |
| 56 | -8 |
| 57 | 1972 |
| 58 | 1534 |
| 59 | 3422 |
| 60 | -1248 |
| 61 | 3660 |
| 62 | 1764 |
| 63 | 330 |
| 64 | -3 |
| 65 | 3036 |
| 66 | -996 |
| 67 | 4422 |