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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 17 |
| 5 | 38 |
| 6 | 87 |
| 7 | 200 |
| 8 | 458 |
| 9 | 1044 |
| 10 | 2373 |
| 11 | 5388 |
| 12 | 12233 |
| 13 | 27782 |
| 14 | 63112 |
| 15 | 143392 |
| 16 | 325805 |
| 17 | 740266 |
| 18 | 1681935 |
| 19 | 3821412 |
| 20 | 8682310 |
| 21 | 19726316 |
| 22 | 44818473 |
| 23 | 101828344 |
| 24 | 231355953 |
| 25 | 525645354 |
| 26 | 1194276812 |
| 27 | 2713420728 |
| 28 | 6164945513 |
| 29 | 14006877390 |