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 | 5 |
| 3 | 14 |
| 4 | 46 |
| 5 | 156 |
| 6 | 561 |
| 7 | 2037 |
| 8 | 7525 |
| 9 | 27874 |
| 10 | 103741 |
| 11 | 386386 |
| 12 | 1440946 |
| 13 | 5374772 |
| 14 | 20054945 |
| 15 | 74835209 |
| 16 | 279273961 |
| 17 | 1042224066 |
| 18 | 3889577781 |
| 19 | 14515950582 |
| 20 | 54174058390 |
| 21 | 202179773644 |
| 22 | 754544416081 |
| 23 | 2815995989821 |
| 24 | 10509437228941 |
| 25 | 39221745831842 |
| 26 | 146377537461485 |