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 | 2 |
| 3 | 7 |
| 4 | 5 |
| 5 | 311 |
| 6 | 434 |
| 7 | 42799 |
| 8 | 90075 |
| 9 | 12345679 |
| 10 | 34867844 |
| 11 | 6140565047 |
| 12 | 1695421 |
| 13 | 4696537119847 |
| 14 | 20088655029078 |
| 15 | 5124095576030431 |
| 16 | 25657845139503479 |
| 17 | 7563707819165039903 |
| 18 | 43404581642184336392 |
| 19 | 14523213296398891966759 |