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 | 7 |
| 4 | 9 |
| 5 | 31 |
| 6 | 21 |
| 7 | 127 |
| 8 | 27 |
| 9 | 49 |
| 10 | 93 |
| 11 | 3583 |
| 12 | 63 |
| 13 | 8191 |
| 14 | 381 |
| 15 | 217 |
| 16 | 81 |
| 17 | 131071 |
| 18 | 147 |
| 19 | 524287 |
| 20 | 279 |
| 21 | 889 |
| 22 | 10749 |
| 23 | 14680063 |
| 24 | 189 |
| 25 | 961 |
| 26 | 24573 |
| 27 | 343 |
| 28 | 1143 |
| 29 | 1073479679 |
| 30 | 651 |
| 31 | 2147483647 |
| 32 | 243 |
| 33 | 25081 |
| 34 | 393213 |
| 35 | 3937 |
| 36 | 441 |
| 37 | 266287972351 |
| 38 | 1572861 |
| 39 | 57337 |
| 40 | 837 |