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 | 3 |
| 2 | 3 |
| 3 | 6 |
| 4 | 12 |
| 5 | 24 |
| 6 | 42 |
| 7 | 78 |
| 8 | 144 |
| 9 | 234 |
| 10 | 456 |
| 11 | 726 |
| 12 | 1392 |
| 13 | 2184 |
| 14 | 4290 |
| 15 | 6528 |
| 16 | 12960 |
| 17 | 19680 |
| 18 | 39078 |
| 19 | 59046 |
| 20 | 117600 |
| 21 | 177060 |
| 22 | 353562 |
| 23 | 531438 |
| 24 | 1061280 |
| 25 | 1594296 |
| 26 | 3186456 |
| 27 | 4782726 |
| 28 | 9561552 |
| 29 | 14348904 |
| 30 | 28690752 |
| 31 | 43046718 |