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 | 1 |
| 3 | 6 |
| 4 | 27 |
| 5 | 110 |
| 6 | 430 |
| 7 | 1652 |
| 8 | 6307 |
| 9 | 24054 |
| 10 | 91866 |
| 11 | 351692 |
| 12 | 1350030 |
| 13 | 5196204 |
| 14 | 20050108 |
| 15 | 77542376 |
| 16 | 300507427 |
| 17 | 1166737574 |
| 18 | 4537436578 |
| 19 | 17672369756 |
| 20 | 68922740122 |
| 21 | 269127888644 |
| 22 | 1052047384708 |
| 23 | 4116711169496 |
| 24 | 16123793452942 |
| 25 | 63205286441660 |
| 26 | 247959232919620 |
| 27 | 973469645715192 |