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 | 10 |
| 5 | 79 |
| 6 | 602 |
| 7 | 4682 |
| 8 | 38072 |
| 9 | 326570 |
| 10 | 2964992 |
| 11 | 28506383 |
| 12 | 289973248 |
| 13 | 3116028865 |
| 14 | 35308153600 |
| 15 | 421048783264 |
| 16 | 5273818620928 |
| 17 | 69250997724484 |
| 18 | 951571372015616 |
| 19 | 13658940616055885 |
| 20 | 204474999700324352 |
| 21 | 3187421031909630947 |
| 22 | 51663403849575956480 |