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 | 16 |
| 3 | 44 |
| 4 | 256 |
| 5 | 1068 |
| 6 | 5082 |
| 7 | 22912 |
| 8 | 105586 |
| 9 | 482204 |
| 10 | 2210256 |
| 11 | 10115926 |
| 12 | 46327024 |
| 13 | 212107056 |
| 14 | 971225210 |
| 15 | 4446995942 |
| 16 | 20362020404 |
| 17 | 93233503292 |
| 18 | 426898240022 |
| 19 | 1954682503544 |
| 20 | 8950108307086 |
| 21 | 40980784959354 |
| 22 | 187642965834692 |