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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 44 |
| 6 | 153 |
| 7 | 583 |
| 8 | 2410 |
| 9 | 10721 |
| 10 | 50965 |
| 11 | 257393 |
| 12 | 1374187 |
| 13 | 7722862 |
| 14 | 45520064 |
| 15 | 280502924 |
| 16 | 1802060232 |
| 17 | 12040040899 |
| 18 | 83475921469 |
| 19 | 599400745354 |
| 20 | 4449689901306 |
| 21 | 34096169966924 |
| 22 | 269286884243138 |
| 23 | 2189193150557825 |
| 24 | 18297258191472880 |
| 25 | 157049750065028868 |