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 | 14 |
| 2 | 86 |
| 3 | 434 |
| 4 | 2542 |
| 5 | 15134 |
| 6 | 92318 |
| 7 | 570822 |
| 8 | 3567150 |
| 9 | 22467638 |
| 10 | 142378416 |
| 11 | 906569832 |
| 12 | 5794153978 |
| 13 | 37142273910 |
| 14 | 238653335454 |
| 15 | 1536292377434 |
| 16 | 9904175388110 |
| 17 | 63924370849750 |
| 18 | 412963549917890 |
| 19 | 2669744556760982 |