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 | 2 |
| 2 | 8 |
| 3 | 18 |
| 4 | 66 |
| 5 | 189 |
| 6 | 209 |
| 7 | 408 |
| 8 | 2208 |
| 9 | 2816 |
| 10 | 3168 |
| 11 | 3912 |
| 12 | 20909 |
| 13 | 54792 |
| 14 | 59973 |
| 15 | 157169 |
| 16 | 303093 |
| 17 | 709968 |
| 18 | 801978 |
| 19 | 1832496 |
| 20 | 2145353 |
| 21 | 2291610 |
| 22 | 5082306 |
| 23 | 10829346 |
| 24 | 16408818 |