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 | 3 |
| 3 | 9 |
| 4 | 29 |
| 5 | 99 |
| 6 | 348 |
| 7 | 1260 |
| 8 | 4644 |
| 9 | 17382 |
| 10 | 65822 |
| 11 | 251655 |
| 12 | 969819 |
| 13 | 3762517 |
| 14 | 14680890 |
| 15 | 57567228 |
| 16 | 226712655 |
| 17 | 896252850 |
| 18 | 3555116583 |
| 19 | 14144563158 |