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 | 0 |
| 2 | 6 |
| 3 | 50 |
| 4 | 322 |
| 5 | 1874 |
| 6 | 10558 |
| 7 | 58716 |
| 8 | 325758 |
| 9 | 1808778 |
| 10 | 10068548 |
| 11 | 56213606 |
| 12 | 314785072 |
| 13 | 1767660604 |
| 14 | 9951449844 |
| 15 | 56151698716 |
| 16 | 317484868212 |
| 17 | 1798343124800 |
| 18 | 10203031413894 |