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 | 131071 |
| 1 | 33423871 |
| 2 | 505290271 |
| 3 | 1717986919 |
| 4 | 2863311531 |
| 5 | 3579139413 |
| 6 | 5055419121 |
| 7 | 10094819116 |
| 8 | 22645810751 |
| 9 | 41800423686 |
| 10 | 78201007705 |
| 11 | 120750351308 |
| 12 | 163539395911 |
| 13 | 320531740310 |