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 | 5 |
| 3 | 13 |
| 4 | 69 |
| 5 | 631 |
| 6 | 7783 |
| 7 | 117657 |
| 8 | 2097161 |
| 9 | 43046731 |
| 10 | 1000000011 |
| 11 | 25937424613 |
| 12 | 743008370701 |
| 13 | 23298085122495 |
| 14 | 793714773254159 |
| 15 | 29192926025390641 |
| 16 | 1152921504606846993 |
| 17 | 48661191875666868499 |
| 18 | 2185911559738696531987 |
| 19 | 104127350297911241532861 |