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 | 1 |
| 2 | 3 |
| 3 | -1 |
| 4 | 5 |
| 5 | 23 |
| 6 | 1 |
| 7 | -1 |
| 8 | 9 |
| 9 | 55 |
| 10 | -19 |
| 11 | 11 |
| 12 | -19 |
| 13 | 251 |
| 14 | 1901 |
| 15 | 27 |
| 16 | -11 |
| 17 | 11 |
| 18 | -27 |
| 19 | 475 |
| 20 | 4277 |
| 21 | -863 |
| 22 | 271 |
| 23 | -191 |
| 24 | 271 |
| 25 | -863 |
| 26 | 19087 |
| 27 | 198721 |
| 28 | 1375 |
| 29 | -351 |
| 30 | 191 |
| 31 | -191 |
| 32 | 351 |
| 33 | -1375 |
| 34 | 36799 |
| 35 | 434241 |
| 36 | -33953 |
| 37 | 7297 |
| 38 | -3233 |
| 39 | 2497 |
| 40 | -3233 |
| 41 | 7297 |
| 42 | -33953 |
| 43 | 1070017 |
| 44 | 14097247 |
| 45 | 57281 |
| 46 | -10625 |
| 47 | 3969 |