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 | 0 |
| 1 | 12 |
| 2 | 24 |
| 3 | 72 |
| 4 | 192 |
| 5 | 528 |
| 6 | 1440 |
| 7 | 3936 |
| 8 | 10752 |
| 9 | 29376 |
| 10 | 80256 |
| 11 | 219264 |
| 12 | 599040 |
| 13 | 1636608 |
| 14 | 4471296 |
| 15 | 12215808 |
| 16 | 33374208 |
| 17 | 91180032 |
| 18 | 249108480 |
| 19 | 680577024 |
| 20 | 1859371008 |
| 21 | 5079896064 |
| 22 | 13878534144 |
| 23 | 37916860416 |
| 24 | 103590789120 |
| 25 | 283015299072 |
| 26 | 773212176384 |
| 27 | 2112454950912 |