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 | 3 |
| 2 | 12 |
| 3 | 47 |
| 4 | 189 |
| 5 | 773 |
| 6 | 3208 |
| 7 | 13478 |
| 8 | 57222 |
| 9 | 245134 |
| 10 | 1058348 |
| 11 | 4600571 |
| 12 | 20118753 |
| 13 | 88450897 |
| 14 | 390721560 |
| 15 | 1733348234 |
| 16 | 7719287578 |
| 17 | 34497374034 |
| 18 | 154659735720 |
| 19 | 695397289078 |
| 20 | 3135087583426 |
| 21 | 14168892518258 |
| 22 | 64181607367952 |