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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 43 |
| 5 | 154 |
| 6 | 668 |
| 7 | 2214 |
| 8 | 6876 |
| 9 | 16864 |
| 10 | 41970 |
| 11 | 94710 |
| 12 | 202027 |
| 13 | 429733 |
| 14 | 889207 |
| 15 | 1549511 |
| 16 | 3238700 |
| 17 | 5053317 |
| 18 | 8502061 |
| 19 | 15583775 |
| 20 | 25070899 |
| 21 | 40588284 |
| 22 | 63604514 |