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) |
|---|---|
| 7 | 1 |
| 8 | 5 |
| 9 | 31 |
| 10 | 173 |
| 11 | 1521 |
| 12 | 4224 |
| 13 | 33418 |
| 14 | 184183 |
| 15 | 1370009 |
| 16 | 3798472 |
| 17 | 26957026 |
| 18 | 150399317 |
| 19 | 1034714947 |
| 20 | 2897704261 |
| 21 | 19494273755 |
| 22 | 109619578524 |
| 23 | 724456628891 |