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 | 9 |
| 1 | 6 |
| 2 | 19 |
| 3 | 48 |
| 4 | 89 |
| 5 | 190 |
| 6 | 391 |
| 7 | 784 |
| 8 | 1577 |
| 9 | 3142 |
| 10 | 6219 |
| 11 | 12256 |
| 12 | 24041 |
| 13 | 46974 |
| 14 | 91471 |
| 15 | 177568 |
| 16 | 343753 |
| 17 | 663814 |
| 18 | 1278979 |
| 19 | 2459152 |
| 20 | 4719417 |
| 21 | 9041470 |
| 22 | 17294039 |
| 23 | 33030320 |
| 24 | 62999145 |
| 25 | 120006214 |
| 26 | 228327099 |
| 27 | 433939904 |
| 28 | 823854793 |
| 29 | 1562602238 |