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) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 89 |
| 3 | 1447 |
| 4 | 26713 |
| 5 | 532391 |
| 6 | 11165785 |
| 7 | 242851751 |
| 8 | 5427716185 |
| 9 | 123901026215 |
| 10 | 2876525797465 |
| 11 | 67710590623655 |
| 12 | 1612262780199001 |
| 13 | 38764533106581415 |
| 14 | 939825790848884825 |
| 15 | 22950405085586497447 |