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 | 11 |
| 3 | 66 |
| 4 | 341 |
| 5 | 1606 |
| 6 | 7238 |
| 7 | 31548 |
| 8 | 134728 |
| 9 | 565983 |
| 10 | 2350183 |
| 11 | 9661465 |
| 12 | 39401792 |
| 13 | 159527302 |
| 14 | 641733862 |
| 15 | 2565774277 |
| 16 | 10198601886 |
| 17 | 40305279454 |
| 18 | 158376907546 |
| 19 | 618742851276 |
| 20 | 2403142436321 |