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 | 2 |
| 2 | 6 |
| 3 | 23 |
| 4 | 109 |
| 5 | 621 |
| 6 | 4149 |
| 7 | 31851 |
| 8 | 276408 |
| 9 | 2676388 |
| 10 | 28608866 |
| 11 | 334647768 |
| 12 | 4252140022 |
| 13 | 58322409086 |
| 14 | 858871301034 |