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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 33 |
| 7 | 93 |
| 8 | 276 |
| 9 | 833 |
| 10 | 2574 |
| 11 | 8057 |
| 12 | 25565 |
| 13 | 81889 |
| 14 | 264703 |
| 15 | 861889 |
| 16 | 2824974 |
| 17 | 9311875 |
| 18 | 30851395 |
| 19 | 102676439 |
| 20 | 343112116 |
| 21 | 1150785092 |
| 22 | 3872588051 |
| 23 | 13071583810 |
| 24 | 44245023261 |
| 25 | 150145281903 |
| 26 | 510721124972 |
| 27 | 1741020966255 |
| 28 | 5947081503460 |
| 29 | 20352707950277 |