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 | 2 |
| 1 | 5 |
| 2 | 11 |
| 3 | 25 |
| 4 | 55 |
| 5 | 123 |
| 6 | 275 |
| 7 | 615 |
| 8 | 1375 |
| 9 | 3075 |
| 10 | 6875 |
| 11 | 15373 |
| 12 | 34375 |
| 13 | 76865 |
| 14 | 171875 |
| 15 | 384325 |
| 16 | 859376 |
| 17 | 1921624 |
| 18 | 4296881 |
| 19 | 9608119 |
| 20 | 21484407 |
| 21 | 48040595 |
| 22 | 107422036 |
| 23 | 240202975 |
| 24 | 537110180 |
| 25 | 1201014874 |
| 26 | 2685550900 |
| 27 | 6005074370 |
| 28 | 13427754501 |