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 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 33 |
| 5 | 96 |
| 6 | 278 |
| 7 | 787 |
| 8 | 2205 |
| 9 | 6133 |
| 10 | 16941 |
| 11 | 46554 |
| 12 | 127390 |
| 13 | 347331 |
| 14 | 944121 |
| 15 | 2559607 |
| 16 | 6923529 |
| 17 | 18690138 |
| 18 | 50364988 |
| 19 | 135506485 |
| 20 | 364063815 |
| 21 | 976880631 |
| 22 | 2618206923 |
| 23 | 7009868646 |
| 24 | 18749876418 |
| 25 | 50107633501 |
| 26 | 133800148323 |
| 27 | 357012426677 |
| 28 | 951936494055 |