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 | 1 |
| 2 | 31 |
| 3 | 347529 |
| 4 | 10773399 |
| 5 | 4104665019 |
| 6 | 28732655133 |
| 7 | 28732655133 |
| 8 | 35492068813383 |
| 9 | 108695634368139 |
| 10 | 461396894573979 |
| 11 | 2529134502772059 |
| 12 | 2529134502772059 |
| 13 | 99414440839732473 |
| 14 | 175792216832685999 |
| 15 | 175792216832685999 |