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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 7 |
| 6 | 9 |
| 7 | 18 |
| 8 | 47 |
| 9 | 123 |
| 10 | 161 |
| 11 | 322 |
| 12 | 843 |
| 13 | 2207 |
| 14 | 2889 |
| 15 | 5778 |
| 16 | 15127 |
| 17 | 39603 |
| 18 | 51841 |
| 19 | 103682 |
| 20 | 271443 |
| 21 | 710647 |
| 22 | 930249 |
| 23 | 1860498 |
| 24 | 4870847 |
| 25 | 12752043 |
| 26 | 16692641 |
| 27 | 33385282 |