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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 16 |
| 6 | 59 |
| 7 | 246 |
| 8 | 1131 |
| 9 | 5655 |
| 10 | 30428 |
| 11 | 174835 |
| 12 | 1066334 |
| 13 | 6870542 |
| 14 | 46581883 |
| 15 | 331237074 |
| 16 | 2463361903 |
| 17 | 19112314727 |
| 18 | 154364077009 |
| 19 | 1295325828045 |
| 20 | 11273167827343 |
| 21 | 101589943242179 |
| 22 | 946577526626181 |
| 23 | 9107029927925714 |
| 24 | 90359115887726302 |
| 25 | 923509462029444933 |