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 | 16 |
| 4 | 53 |
| 5 | 178 |
| 6 | 609 |
| 7 | 2112 |
| 8 | 7393 |
| 9 | 26066 |
| 10 | 92437 |
| 11 | 329360 |
| 12 | 1178149 |
| 13 | 4228322 |
| 14 | 15218305 |
| 15 | 54907136 |
| 16 | 198527617 |
| 17 | 719170850 |
| 18 | 2609577701 |
| 19 | 9483269008 |
| 20 | 34508808789 |
| 21 | 125727351186 |
| 22 | 458573578977 |
| 23 | 1674270763584 |
| 24 | 6118472289889 |
| 25 | 22378379004146 |
| 26 | 81913223571701 |