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 | 1 |
| 3 | -1 |
| 4 | 1 |
| 5 | 1 |
| 6 | -3 |
| 7 | -1 |
| 8 | 1 |
| 9 | 1 |
| 10 | 1 |
| 11 | -7 |
| 12 | -4 |
| 13 | 13 |
| 14 | 4 |
| 15 | -7 |
| 16 | -1 |
| 17 | 1 |
| 18 | 1 |
| 19 | 1 |
| 20 | -15 |
| 21 | -11 |
| 22 | 83 |
| 23 | 45 |
| 24 | -220 |
| 25 | -88 |
| 26 | 303 |
| 27 | 88 |
| 28 | -220 |
| 29 | -45 |
| 30 | 83 |
| 31 | 11 |
| 32 | -15 |
| 33 | -1 |
| 34 | 1 |
| 35 | 1 |
| 36 | 1 |
| 37 | -31 |
| 38 | -26 |
| 39 | 413 |
| 40 | 293 |
| 41 | -3141 |
| 42 | -1896 |
| 43 | 15261 |
| 44 | 7866 |
| 45 | -50187 |
| 46 | -22122 |
| 47 | 115410 |
| 48 | 43488 |
| 49 | -189036 |
| 50 | -60753 |
| 51 | 222621 |
| 52 | 60753 |
| 53 | -189036 |