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 | 13 |
| 2 | 4093 |
| 3 | 1048573 |
| 4 | 1336333 |
| 5 | 2085133 |
| 6 | 4477453 |
| 7 | 16777213 |
| 8 | 54700813 |
| 9 | 92236813 |
| 10 | 116985853 |
| 11 | 146409997 |
| 12 | 236421373 |
| 13 | 285609997 |
| 14 | 479785213 |
| 15 | 959512573 |
| 16 | 1003875853 |
| 17 | 1097199373 |
| 18 | 1303209997 |
| 19 | 1871773693 |
| 20 | 2097273613 |
| 21 | 2342559997 |