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 | 5 |
| 3 | 9 |
| 4 | 69 |
| 5 | 33 |
| 6 | 2061 |
| 7 | 129 |
| 8 | 16453 |
| 9 | 4105 |
| 10 | 131109 |
| 11 | 2049 |
| 12 | 134219853 |
| 13 | 8193 |
| 14 | 8388741 |
| 15 | 8388649 |
| 16 | 1073758277 |
| 17 | 131073 |
| 18 | 274877913101 |
| 19 | 524289 |
| 20 | 2199023386725 |
| 21 | 2147483785 |
| 22 | 34359740421 |
| 23 | 8388609 |
| 24 | 576460752437659725 |
| 25 | 1073741857 |
| 26 | 2199023263749 |
| 27 | 549755817993 |
| 28 | 36028797027352773 |
| 29 | 536870913 |
| 30 | 2361183241434831128621 |