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 | 15 |
| 5 | 49 |
| 6 | 168 |
| 7 | 594 |
| 8 | 2149 |
| 9 | 7919 |
| 10 | 29627 |
| 11 | 112254 |
| 12 | 429884 |
| 13 | 1661308 |
| 14 | 6470678 |
| 15 | 25375070 |
| 16 | 100106145 |
| 17 | 397018815 |
| 18 | 1582005849 |
| 19 | 6330533220 |
| 20 | 25428891084 |
| 21 | 102497788194 |
| 22 | 414445390730 |
| 23 | 1680617637425 |
| 24 | 6833083703094 |
| 25 | 27849689394894 |
| 26 | 113762630541908 |