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 | 10 |
| 4 | 25 |
| 5 | 64 |
| 6 | 166 |
| 7 | 437 |
| 8 | 1157 |
| 9 | 3087 |
| 10 | 8276 |
| 11 | 22287 |
| 12 | 60230 |
| 13 | 163284 |
| 14 | 443820 |
| 15 | 1209155 |
| 16 | 3300890 |
| 17 | 9027337 |
| 18 | 24727437 |
| 19 | 67829684 |
| 20 | 186302693 |
| 21 | 512301120 |
| 22 | 1410237805 |
| 23 | 3885803531 |
| 24 | 10716571591 |
| 25 | 29579231200 |
| 26 | 81704634803 |
| 27 | 225845362116 |