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 | 6 |
| 3 | 9 |
| 4 | 11 |
| 5 | 22 |
| 6 | 25 |
| 7 | 70 |
| 8 | 78 |
| 9 | 276 |
| 10 | 497 |
| 11 | 990 |
| 12 | 1771 |
| 13 | 8178 |
| 14 | 20504 |
| 15 | 44254 |
| 16 | 181051 |
| 17 | 416328 |
| 18 | 1013728 |
| 19 | 3383579 |
| 20 | 8667726 |
| 21 | 34332376 |
| 22 | 122289552 |
| 23 | 244215150 |
| 24 | 969751302 |
| 25 | 1865174676 |
| 26 | 6648863728 |
| 27 | 26888317326 |
| 28 | 107132035803 |