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 | 3 |
| 2 | 28 |
| 3 | 275 |
| 4 | 2834 |
| 5 | 30020 |
| 6 | 323817 |
| 7 | 3537963 |
| 8 | 39025125 |
| 9 | 433641593 |
| 10 | 4846850372 |
| 11 | 54432520983 |
| 12 | 613727606977 |
| 13 | 6942918090500 |
| 14 | 78767492060334 |
| 15 | 895824168454107 |
| 16 | 10210180642895226 |
| 17 | 116591635975080084 |
| 18 | 1333619552180129775 |
| 19 | 15277391011739272885 |
| 20 | 175247987032943618365 |