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 | 14 |
| 3 | 79 |
| 4 | 482 |
| 5 | 3088 |
| 6 | 20502 |
| 7 | 139882 |
| 8 | 975084 |
| 9 | 6915354 |
| 10 | 49742974 |
| 11 | 362054512 |
| 12 | 2661657346 |
| 13 | 19735338206 |
| 14 | 147418892116 |
| 15 | 1108339796742 |
| 16 | 8380510594346 |
| 17 | 63689530713888 |
| 18 | 486218971691294 |
| 19 | 3727035449588930 |
| 20 | 28674306373680492 |