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 | 5 |
| 3 | 14 |
| 4 | 47 |
| 5 | 186 |
| 6 | 904 |
| 7 | 5439 |
| 8 | 41418 |
| 9 | 404501 |
| 10 | 5122188 |
| 11 | 84623842 |
| 12 | 1828876351 |
| 13 | 51701216248 |
| 14 | 1908493827243 |
| 15 | 91755916071736 |
| 16 | 5729050033597431 |