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 | 5 |
| 2 | 55 |
| 3 | 785 |
| 4 | 12775 |
| 5 | 224945 |
| 6 | 4174135 |
| 7 | 80404385 |
| 8 | 1592666695 |
| 9 | 32238859025 |
| 10 | 663961262935 |
| 11 | 13868665189505 |
| 12 | 293105002282855 |
| 13 | 6256280361209585 |
| 14 | 134676678504352375 |
| 15 | 2920490688138377825 |
| 16 | 63738849200291875975 |
| 17 | 1398964964239496726225 |
| 18 | 30859472167442041607575 |