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 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 64 |
| 5 | 206 |
| 6 | 616 |
| 7 | 1766 |
| 8 | 4836 |
| 9 | 12910 |
| 10 | 33248 |
| 11 | 83768 |
| 12 | 205693 |
| 13 | 495357 |
| 14 | 1169030 |
| 15 | 2713262 |
| 16 | 6193247 |
| 17 | 13932454 |
| 18 | 30905452 |
| 19 | 67684181 |
| 20 | 146439145 |
| 21 | 313266730 |
| 22 | 663004212 |
| 23 | 1389106622 |
| 24 | 2882712626 |
| 25 | 5928222338 |
| 26 | 12086570971 |
| 27 | 24440494114 |
| 28 | 49035791349 |
| 29 | 97646904849 |