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 | 48 |
| 9 | 1240 |
| 10 | 25864 |
| 11 | 496944 |
| 12 | 9234368 |
| 13 | 169378560 |
| 14 | 3095526912 |
| 15 | 56624998400 |
| 16 | 1039080697856 |
| 17 | 19147850612736 |
| 18 | 354499096477696 |
| 19 | 6594549035106304 |
| 20 | 123254413518962688 |
| 21 | 2314187071702433792 |
| 22 | 43639888872132837376 |
| 23 | 826342030562687975424 |
| 24 | 15708220978126028537856 |
| 25 | 299700151992553060696064 |