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 | 1 |
| 2 | 3 |
| 3 | 11 |
| 4 | 44 |
| 5 | 184 |
| 6 | 789 |
| 7 | 3435 |
| 8 | 15100 |
| 9 | 66806 |
| 10 | 296870 |
| 11 | 1323318 |
| 12 | 5911972 |
| 13 | 26455294 |
| 14 | 118528793 |
| 15 | 531540891 |
| 16 | 2385375732 |
| 17 | 10710619014 |
| 18 | 48112492938 |
| 19 | 216195753066 |
| 20 | 971744791032 |
| 21 | 4368674392104 |
| 22 | 19643610378738 |
| 23 | 88339070102046 |
| 24 | 397313118498744 |
| 25 | 1787115246076764 |