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 | 9 |
| 2 | 13 |
| 3 | 37 |
| 4 | 133 |
| 5 | 2053 |
| 6 | 8197 |
| 7 | 131077 |
| 8 | 524293 |
| 9 | 8388613 |
| 10 | 536870917 |
| 11 | 2147483653 |
| 12 | 137438953477 |
| 13 | 2199023255557 |
| 14 | 8796093022213 |
| 15 | 140737488355333 |
| 16 | 9007199254740997 |
| 17 | 576460752303423493 |
| 18 | 2305843009213693957 |
| 19 | 147573952589676412933 |
| 20 | 2361183241434822606853 |