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 | 0 |
| 1 | 3 |
| 2 | 10 |
| 3 | 27 |
| 4 | 68 |
| 5 | 165 |
| 6 | 390 |
| 7 | 903 |
| 8 | 2056 |
| 9 | 4617 |
| 10 | 10250 |
| 11 | 22539 |
| 12 | 49164 |
| 13 | 106509 |
| 14 | 229390 |
| 15 | 491535 |
| 16 | 1048592 |
| 17 | 2228241 |
| 18 | 4718610 |
| 19 | 9961491 |
| 20 | 20971540 |
| 21 | 44040213 |
| 22 | 92274710 |
| 23 | 192938007 |
| 24 | 402653208 |
| 25 | 838860825 |
| 26 | 1744830490 |
| 27 | 3623878683 |
| 28 | 7516192796 |