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) |
|---|---|
| 5 | 10 |
| 6 | 248 |
| 7 | 4618 |
| 8 | 46736 |
| 9 | 310496 |
| 10 | 1535440 |
| 11 | 6110256 |
| 12 | 20609544 |
| 13 | 60963094 |
| 14 | 162323448 |
| 15 | 396155466 |
| 16 | 899046952 |
| 17 | 1917743448 |
| 18 | 3879011584 |
| 19 | 7491080844 |
| 20 | 13892164232 |
| 21 | 24854703014 |
| 22 | 43071383040 |
| 23 | 72532831794 |
| 24 | 119038462248 |
| 25 | 190849299076 |