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 | 1 |
| 2 | 4 |
| 3 | 19 |
| 4 | 128 |
| 5 | 861 |
| 6 | 6051 |
| 7 | 42475 |
| 8 | 297993 |
| 9 | 2081607 |
| 10 | 14485077 |
| 11 | 100475175 |
| 12 | 694838429 |
| 13 | 4793805002 |