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 | 6 |
| 4 | 22 |
| 5 | 93 |
| 6 | 421 |
| 7 | 2010 |
| 8 | 9926 |
| 9 | 50357 |
| 10 | 260728 |
| 11 | 1372436 |
| 12 | 7321982 |
| 13 | 39504181 |
| 14 | 215168221 |
| 15 | 1181540841 |
| 16 | 6534058589 |
| 17 | 36357935615 |
| 18 | 203414689462 |
| 19 | 1143589234086 |
| 20 | 6457159029573 |
| 21 | 36602333187792 |
| 22 | 208214459462774 |
| 23 | 1188252476400972 |
| 24 | 6801133579291811 |
| 25 | 39032172166792887 |