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 | 12 |
| 3 | 97 |
| 4 | 654 |
| 5 | 3977 |
| 6 | 22624 |
| 7 | 122821 |
| 8 | 644082 |
| 9 | 3288739 |
| 10 | 16440648 |
| 11 | 80783857 |
| 12 | 391310240 |
| 13 | 1872763387 |
| 14 | 8870963422 |
| 15 | 41647686501 |
| 16 | 194014270964 |
| 17 | 897639074623 |
| 18 | 4127904278590 |
| 19 | 18879838654237 |
| 20 | 85930246593928 |