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 | 6 |
| 3 | 21 |
| 4 | 115 |
| 5 | 836 |
| 6 | 6943 |
| 7 | 63113 |
| 8 | 585517 |
| 9 | 5263827 |
| 10 | 45808290 |
| 11 | 398309972 |