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 | 0 |
| 2 | 1 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 1 |
| 7 | 2 |
| 8 | -2 |
| 9 | 0 |
| 10 | 1 |
| 11 | 8 |
| 12 | -8 |
| 13 | 0 |
| 14 | 1 |
| 15 | 22 |
| 16 | -6 |
| 17 | -32 |
| 18 | 16 |
| 19 | 0 |
| 20 | 1 |
| 21 | 52 |
| 22 | 84 |
| 23 | -272 |
| 24 | 136 |
| 25 | 0 |
| 26 | 1 |
| 27 | 114 |
| 28 | 606 |
| 29 | -1168 |
| 30 | -96 |
| 31 | 816 |
| 32 | -272 |
| 33 | 0 |
| 34 | 1 |
| 35 | 240 |
| 36 | 2832 |
| 37 | -2176 |
| 38 | -8832 |
| 39 | 11904 |
| 40 | -3968 |
| 41 | 0 |
| 42 | 1 |
| 43 | 494 |
| 44 | 11122 |
| 45 | 11072 |
| 46 | -83360 |
| 47 | 71168 |
| 48 | 13312 |
| 49 | -31744 |
| 50 | 7936 |
| 51 | 0 |
| 52 | 1 |
| 53 | 1004 |
| 54 | 39772 |
| 55 | 148592 |
| 56 | -472760 |
| 57 | -17152 |
| 58 | 831232 |
| 59 | -707584 |
| 60 | 176896 |