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) |
|---|---|
| 0 | 1 |
| 1 | -3 |
| 2 | -3 |
| 3 | 15 |
| 4 | -3 |
| 5 | -18 |
| 6 | 15 |
| 7 | -24 |
| 8 | -3 |
| 9 | 69 |
| 10 | -18 |
| 11 | -36 |
| 12 | 15 |
| 13 | -42 |
| 14 | -24 |
| 15 | 90 |
| 16 | -3 |
| 17 | -54 |
| 18 | 69 |
| 19 | -60 |
| 20 | -18 |
| 21 | 120 |
| 22 | -36 |
| 23 | -72 |
| 24 | 15 |
| 25 | -93 |
| 26 | -42 |
| 27 | 231 |
| 28 | -24 |
| 29 | -90 |
| 30 | 90 |
| 31 | -96 |
| 32 | -3 |
| 33 | 180 |
| 34 | -54 |
| 35 | -144 |
| 36 | 69 |
| 37 | -114 |
| 38 | -60 |
| 39 | 210 |
| 40 | -18 |
| 41 | -126 |
| 42 | 120 |
| 43 | -132 |
| 44 | -36 |
| 45 | 414 |
| 46 | -72 |
| 47 | -144 |
| 48 | 15 |
| 49 | -171 |
| 50 | -93 |
| 51 | 270 |
| 52 | -42 |
| 53 | -162 |