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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 15 |
| 6 | 32 |
| 7 | 66 |
| 8 | 142 |
| 9 | 306 |
| 10 | 672 |
| 11 | 1483 |
| 12 | 3316 |
| 13 | 7446 |
| 14 | 16859 |
| 15 | 38353 |
| 16 | 87735 |
| 17 | 201510 |
| 18 | 464801 |
| 19 | 1075744 |
| 20 | 2498053 |
| 21 | 5817576 |
| 22 | 13585231 |
| 23 | 31801732 |
| 24 | 74615404 |
| 25 | 175433624 |
| 26 | 413281276 |
| 27 | 975355639 |
| 28 | 2305763635 |
| 29 | 5459480822 |
| 30 | 12945857671 |