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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 33 |
| 5 | 194 |
| 6 | 1198 |
| 7 | 7676 |
| 8 | 50581 |
| 9 | 340682 |
| 10 | 2335186 |
| 11 | 16237284 |
| 12 | 114255994 |
| 13 | 812107412 |
| 14 | 5822171548 |
| 15 | 42052209400 |
| 16 | 305714145869 |
| 17 | 2235262899418 |
| 18 | 16426616425002 |
| 19 | 121265916776148 |
| 20 | 898878250833358 |
| 21 | 6687497426512700 |
| 22 | 49920590244564484 |