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 | 2 |
| 2 | 8 |
| 3 | 36 |
| 4 | 104 |
| 5 | 300 |
| 6 | 864 |
| 7 | 2268 |
| 8 | 5824 |
| 9 | 14418 |
| 10 | 35760 |
| 11 | 85888 |
| 12 | 204816 |
| 13 | 479804 |
| 14 | 1113280 |
| 15 | 2560560 |
| 16 | 5836704 |
| 17 | 13209612 |
| 18 | 29690208 |
| 19 | 66332572 |
| 20 | 147350880 |
| 21 | 325780056 |
| 22 | 716862256 |
| 23 | 1571067072 |
| 24 | 3429697920 |
| 25 | 7461222850 |
| 26 | 16178111560 |
| 27 | 34973640108 |
| 28 | 75392349648 |