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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 9 |
| 6 | 23 |
| 7 | 65 |
| 8 | 199 |
| 9 | 654 |
| 10 | 2296 |
| 11 | 8569 |
| 12 | 33825 |
| 13 | 140581 |
| 14 | 612933 |
| 15 | 2795182 |
| 16 | 13298464 |
| 17 | 65852872 |
| 18 | 338694406 |
| 19 | 1805809431 |
| 20 | 9963758843 |
| 21 | 56805378239 |
| 22 | 334156440067 |
| 23 | 2025424520548 |
| 24 | 12633195093794 |
| 25 | 80976535864874 |
| 26 | 532652296499548 |