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 | 2 |
| 2 | 6 |
| 3 | 21 |
| 4 | 115 |
| 5 | 816 |
| 6 | 7185 |
| 7 | 68890 |
| 8 | 671796 |
| 9 | 6347005 |
| 10 | 56180274 |
| 11 | 460040399 |
| 12 | 3470013146 |
| 13 | 24151911854 |
| 14 | 155703390684 |