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 | 24 |
| 5 | 60 |
| 6 | 146 |
| 7 | 366 |
| 8 | 912 |
| 9 | 2302 |
| 10 | 5800 |
| 11 | 14722 |
| 12 | 37368 |
| 13 | 95304 |
| 14 | 243168 |
| 15 | 622518 |
| 16 | 1594622 |
| 17 | 4094768 |
| 18 | 10521384 |
| 19 | 27085436 |
| 20 | 69768478 |
| 21 | 179982688 |
| 22 | 464564220 |
| 23 | 1200563864 |
| 24 | 3104192722 |
| 25 | 8034256412 |
| 26 | 20803994184 |
| 27 | 53915334890 |
| 28 | 139785953076 |
| 29 | 362681515714 |
| 30 | 941361260956 |
| 31 | 2444866458524 |
| 32 | 6351963691964 |