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 | 3 |
| 2 | 15 |
| 3 | 1023 |
| 4 | 6399 |
| 5 | 10815 |
| 6 | 15375 |
| 7 | 26895 |
| 8 | 53823 |
| 9 | 55695 |
| 10 | 65535 |
| 11 | 80655 |
| 12 | 107583 |
| 13 | 118335 |
| 14 | 262143 |
| 15 | 309135 |
| 16 | 440895 |
| 17 | 614655 |
| 18 | 633615 |
| 19 | 817215 |
| 20 | 891135 |
| 21 | 1236543 |
| 22 | 1784895 |
| 23 | 2676495 |
| 24 | 2715903 |
| 25 | 2849343 |
| 26 | 2985983 |
| 27 | 3182655 |
| 28 | 3225615 |
| 29 | 3268863 |
| 30 | 4194303 |
| 31 | 4326399 |
| 32 | 4343055 |
| 33 | 4596735 |
| 34 | 5053503 |