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 | 2 |
| 2 | 8 |
| 3 | 46 |
| 4 | 338 |
| 5 | 2930 |
| 6 | 28726 |
| 7 | 311342 |
| 8 | 3679778 |
| 9 | 47000002 |
| 10 | 644538614 |
| 11 | 9443216366 |
| 12 | 147222001954 |
| 13 | 2434125748082 |
| 14 | 42555399987686 |
| 15 | 784634319490894 |
| 16 | 15221022251713538 |
| 17 | 309977607819594818 |
| 18 | 6613678784212854646 |