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 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 24 |
| 4 | 58 |
| 5 | 140 |
| 6 | 338 |
| 7 | 816 |
| 8 | 1970 |
| 9 | 4756 |
| 10 | 11448 |
| 11 | 27448 |
| 12 | 65260 |
| 13 | 154192 |
| 14 | 360692 |
| 15 | 827540 |
| 16 | 1851345 |
| 17 | 3968840 |
| 18 | 7891990 |
| 19 | 13659821 |
| 20 | 18471682 |
| 21 | 16586822 |
| 22 | 8039455 |
| 23 | 1511110 |
| 24 | 47351 |
| 25 | 87 |