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 | 2 |
| 1 | 17 |
| 2 | 227 |
| 3 | 2309 |
| 4 | 21391 |
| 5 | 185707 |
| 6 | 1549817 |
| 7 | 12579617 |
| 8 | 100061641 |
| 9 | 783765347 |
| 10 | 6065997263 |
| 11 | 46498768471 |
| 12 | 353628459043 |
| 13 | 2671659677783 |
| 14 | 20071277607583 |
| 15 | 150061721792537 |
| 16 | 1117220967868039 |
| 17 | 8287149196682591 |
| 18 | 61270583418289577 |
| 19 | 451682554201973687 |
| 20 | 3321076175415205093 |