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 | 3 |
| 2 | 20 |
| 3 | 101 |
| 4 | 508 |
| 5 | 3053 |
| 6 | 20053 |
| 7 | 141772 |
| 8 | 1045600 |
| 9 | 8038954 |
| 10 | 63830588 |
| 11 | 518935134 |
| 12 | 4311185894 |