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 | 47 |
| 4 | 379 |
| 5 | 9487 |
| 6 | 14233 |
| 7 | 87179 |
| 8 | 44635753 |
| 9 | 1205165611 |
| 10 | 6025828181 |
| 11 | 729125211161 |
| 12 | 972166948343 |
| 13 | 54765404757169 |
| 14 | 71879593743829 |
| 15 | 25876653747779441 |
| 16 | 6624423359431551911 |
| 17 | 1914458350875718742519 |
| 18 | 51690375473644406388353 |
| 19 | 18660225545985630712321553 |
| 20 | 186602255459856307126125437 |