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) |
|---|---|
| 1 | 1 |
| 2 | 12 |
| 3 | 48 |
| 4 | 208 |
| 5 | 768 |
| 6 | 2752 |
| 7 | 9472 |
| 8 | 32000 |
| 9 | 106496 |
| 10 | 351232 |
| 11 | 1150976 |
| 12 | 3756032 |
| 13 | 12222464 |
| 14 | 39698432 |
| 15 | 128778240 |
| 16 | 417398784 |
| 17 | 1352138752 |
| 18 | 4378591232 |
| 19 | 14175698944 |
| 20 | 45886734336 |
| 21 | 148520304640 |
| 22 | 480679821312 |
| 23 | 1555633799168 |
| 24 | 5034389536768 |
| 25 | 16292153131008 |
| 26 | 52723609239552 |
| 27 | 170619454881792 |
| 28 | 552140862914560 |