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) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 210 |
| 3 | 7560 |
| 4 | 415800 |
| 5 | 32432400 |
| 6 | 3405402000 |
| 7 | 463134672000 |
| 8 | 79196028912000 |
| 9 | 16631166071520000 |
| 10 | 4207685016094560000 |
| 11 | 1262305504828368000000 |
| 12 | 443069232194757168000000 |
| 13 | 179886108271071410208000000 |
| 14 | 83647040346048205746720000000 |
| 15 | 44165637302713452634268160000000 |