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 | 2 |
| 2 | 6 |
| 3 | 16 |
| 4 | 48 |
| 5 | 72 |
| 6 | 272 |
| 7 | 816 |
| 8 | 1440 |
| 9 | 1440 |
| 10 | 7936 |
| 11 | 23808 |
| 12 | 44352 |
| 13 | 57600 |
| 14 | 43200 |
| 15 | 353792 |
| 16 | 1061376 |
| 17 | 2027520 |
| 18 | 2903040 |
| 19 | 3024000 |
| 20 | 1814400 |
| 21 | 22368256 |
| 22 | 67104768 |
| 23 | 129964032 |
| 24 | 195379200 |
| 25 | 232243200 |
| 26 | 203212800 |
| 27 | 101606400 |
| 28 | 1903757312 |
| 29 | 5711271936 |