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 | 3 |
| 3 | 5 |
| 4 | 10 |
| 5 | 24 |
| 6 | 66 |
| 7 | 198 |
| 8 | 627 |
| 9 | 2057 |
| 10 | 6919 |
| 11 | 23715 |
| 12 | 82501 |
| 13 | 290513 |
| 14 | 1033413 |
| 15 | 3707853 |
| 16 | 13402698 |
| 17 | 48760368 |
| 18 | 178405158 |
| 19 | 656043858 |
| 20 | 2423307048 |
| 21 | 8987427468 |
| 22 | 33453694488 |
| 23 | 124936258128 |
| 24 | 467995871778 |
| 25 | 1757900019102 |
| 26 | 6619846420554 |