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 | 23 |
| 2 | 450 |
| 3 | 6580 |
| 4 | 86590 |
| 5 | 1073071 |
| 6 | 12803271 |
| 7 | 148755315 |
| 8 | 1694786187 |
| 9 | 19020186047 |
| 10 | 210925125565 |
| 11 | 2316483913054 |
| 12 | 25237165712764 |
| 13 | 273094922940644 |
| 14 | 2938181887791268 |
| 15 | 31454145461543161 |
| 16 | 335264720452385137 |
| 17 | 3559879862893130917 |
| 18 | 37671125212625723995 |
| 19 | 397434517963203503069 |