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) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 10 |
| 6 | 61 |
| 7 | 564 |
| 8 | 7593 |
| 9 | 123874 |
| 10 | 2262877 |
| 11 | 44190279 |
| 12 | 904777809 |
| 13 | 19207129217 |
| 14 | 419870351012 |
| 15 | 9405626692325 |