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 | 6 |
| 2 | 34 |
| 3 | 212 |
| 4 | 1391 |
| 5 | 8764 |
| 6 | 49894 |
| 7 | 251381 |
| 8 | 1122721 |
| 9 | 4490732 |
| 10 | 16284683 |
| 11 | 54165714 |
| 12 | 166968275 |
| 13 | 481237398 |
| 14 | 1306708520 |
| 15 | 3364174219 |
| 16 | 8257222586 |
| 17 | 19412425379 |
| 18 | 43890267973 |
| 19 | 95767324137 |
| 20 | 202278568268 |
| 21 | 414691101885 |
| 22 | 827108931171 |