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 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 61 |
| 6 | 269 |
| 7 | 1337 |
| 8 | 7354 |
| 9 | 44155 |
| 10 | 286397 |
| 11 | 1990427 |
| 12 | 14725738 |
| 13 | 115356349 |
| 14 | 952592288 |
| 15 | 8261093885 |
| 16 | 74994333994 |
| 17 | 710656444489 |
| 18 | 7012302313061 |
| 19 | 71892455879393 |
| 20 | 764331907463476 |
| 21 | 8411953721081635 |
| 22 | 95684448908132498 |