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 | 6 |
| 2 | 45 |
| 3 | 334 |
| 4 | 2385 |
| 5 | 16782 |
| 6 | 117613 |
| 7 | 823494 |
| 8 | 5764737 |
| 9 | 40353526 |
| 10 | 282475149 |
| 11 | 1977326622 |
| 12 | 13841287057 |
| 13 | 96889010238 |
| 14 | 678223072653 |
| 15 | 4747561509718 |
| 16 | 33232930569345 |
| 17 | 232630513986918 |
| 18 | 1628413597910125 |
| 19 | 11398895185372782 |