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 | 1 |
| 2 | 10 |
| 3 | 38 |
| 4 | 156 |
| 5 | 534 |
| 6 | 2014 |
| 7 | 6796 |
| 8 | 23312 |
| 9 | 76165 |
| 10 | 247234 |
| 11 | 780343 |
| 12 | 2435903 |
| 13 | 7453859 |
| 14 | 22538336 |
| 15 | 67130594 |
| 16 | 197666509 |
| 17 | 574876417 |
| 18 | 1654464954 |
| 19 | 4711217687 |
| 20 | 13288453688 |
| 21 | 37133349758 |
| 22 | 102873771662 |
| 23 | 282630567325 |
| 24 | 770410193747 |
| 25 | 2084205092693 |
| 26 | 5598070811010 |