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 | 8191 |
| 1 | 1040447 |
| 2 | 15786439 |
| 3 | 53683801 |
| 4 | 89475754 |
| 5 | 426151179 |
| 6 | 3759235934 |
| 7 | 13422994867 |
| 8 | 22549990279 |
| 9 | 40403963324 |
| 10 | 206697639567 |
| 11 | 825177352150 |
| 12 | 1443261279781 |
| 13 | 6597741209193 |
| 14 | 11064929837983 |
| 15 | 52777249440092 |