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 | 4 |
| 2 | 24 |
| 3 | 96 |
| 4 | 448 |
| 5 | 1792 |
| 6 | 7680 |
| 7 | 30720 |
| 8 | 126976 |
| 9 | 507904 |
| 10 | 2064384 |
| 11 | 8257536 |
| 12 | 33292288 |
| 13 | 133169152 |
| 14 | 534773760 |
| 15 | 2139095040 |
| 16 | 8573157376 |
| 17 | 34292629504 |
| 18 | 137304735744 |
| 19 | 549218942976 |
| 20 | 2197949513728 |
| 21 | 8791798054912 |
| 22 | 35175782154240 |
| 23 | 140703128616960 |
| 24 | 562881233944576 |