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 | 1 |
| 2 | 5 |
| 3 | 33 |
| 4 | 311 |
| 5 | 3802 |
| 6 | 56800 |
| 7 | 1003061 |
| 8 | 20441409 |
| 9 | 472161363 |
| 10 | 12189944200 |
| 11 | 347854999335 |
| 12 | 10872213398723 |
| 13 | 369369563065819 |
| 14 | 13553043160362243 |
| 15 | 534138422146939893 |
| 16 | 22502990284669009819 |
| 17 | 1009214769013552542796 |
| 18 | 48004835269442445650150 |