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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 24 |
| 6 | 77 |
| 7 | 241 |
| 8 | 738 |
| 9 | 2227 |
| 10 | 6650 |
| 11 | 19711 |
| 12 | 58114 |
| 13 | 170682 |
| 14 | 499911 |
| 15 | 1461284 |
| 16 | 4265437 |
| 17 | 12438449 |
| 18 | 36247956 |
| 19 | 105589899 |
| 20 | 307513742 |
| 21 | 895514715 |
| 22 | 2607925982 |
| 23 | 7595726764 |
| 24 | 22127052759 |
| 25 | 64473303788 |
| 26 | 187912261301 |
| 27 | 547850119836 |