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 | -3 |
| 3 | 0 |
| 4 | 7 |
| 5 | -6 |
| 6 | 0 |
| 7 | 8 |
| 8 | -15 |
| 9 | 0 |
| 10 | 18 |
| 11 | -12 |
| 12 | 0 |
| 13 | 14 |
| 14 | -24 |
| 15 | 0 |
| 16 | 31 |
| 17 | -18 |
| 18 | 0 |
| 19 | 20 |
| 20 | -42 |
| 21 | 0 |
| 22 | 36 |
| 23 | -24 |
| 24 | 0 |
| 25 | 31 |
| 26 | -42 |
| 27 | 0 |
| 28 | 56 |
| 29 | -30 |
| 30 | 0 |
| 31 | 32 |
| 32 | -63 |
| 33 | 0 |
| 34 | 54 |
| 35 | -48 |
| 36 | 0 |
| 37 | 38 |
| 38 | -60 |
| 39 | 0 |
| 40 | 90 |
| 41 | -42 |
| 42 | 0 |
| 43 | 44 |
| 44 | -84 |
| 45 | 0 |
| 46 | 72 |
| 47 | -48 |
| 48 | 0 |
| 49 | 57 |
| 50 | -93 |
| 51 | 0 |
| 52 | 98 |
| 53 | -54 |
| 54 | 0 |
| 55 | 72 |
| 56 | -120 |
| 57 | 0 |
| 58 | 90 |
| 59 | -60 |
| 60 | 0 |
| 61 | 62 |
| 62 | -96 |
| 63 | 0 |
| 64 | 127 |
| 65 | -84 |