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 | 3 |
| 1 | 7 |
| 2 | 16 |
| 3 | 37 |
| 4 | 86 |
| 5 | 200 |
| 6 | 465 |
| 7 | 1081 |
| 8 | 2513 |
| 9 | 5842 |
| 10 | 13581 |
| 11 | 31572 |
| 12 | 73396 |
| 13 | 170625 |
| 14 | 396655 |
| 15 | 922111 |
| 16 | 2143648 |
| 17 | 4983377 |
| 18 | 11584946 |
| 19 | 26931732 |
| 20 | 62608681 |
| 21 | 145547525 |
| 22 | 338356945 |
| 23 | 786584466 |
| 24 | 1828587033 |
| 25 | 4250949112 |
| 26 | 9882257736 |
| 27 | 22973462017 |
| 28 | 53406819691 |
| 29 | 124155792775 |