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 | 1 |
| 2 | 3 |
| 3 | 43 |
| 4 | 1177 |
| 5 | 46681 |
| 6 | 2419291 |
| 7 | 154587427 |
| 8 | 11735209585 |
| 9 | 1031418915121 |
| 10 | 102979800567091 |
| 11 | 11510663862332251 |
| 12 | 1423811747933017609 |
| 13 | 193073662118499898633 |
| 14 | 28479005472094048953355 |
| 15 | 4539456019668776334683731 |
| 16 | 777538096585429376795405281 |
| 17 | 142419954152382631361835929185 |