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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 69 |
| 4 | 355 |
| 5 | 1872 |
| 6 | 10037 |
| 7 | 54459 |
| 8 | 298138 |
| 9 | 1643565 |
| 10 | 9111191 |
| 11 | 50739120 |
| 12 | 283635481 |
| 13 | 1590648819 |
| 14 | 8945090870 |
| 15 | 50423423685 |
| 16 | 284831065723 |
| 17 | 1611918320688 |
| 18 | 9137141645645 |
| 19 | 51869777201595 |
| 20 | 294843392318146 |
| 21 | 1677980087882013 |
| 22 | 9559901907126959 |