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 | 6 |
| 2 | 36 |
| 3 | 60 |
| 4 | 126 |
| 5 | 234 |
| 6 | 456 |
| 7 | 896 |
| 8 | 1722 |
| 9 | 3360 |
| 10 | 6512 |
| 11 | 12642 |
| 12 | 24570 |
| 13 | 47644 |
| 14 | 92568 |
| 15 | 179690 |
| 16 | 348800 |
| 17 | 677340 |
| 18 | 1314846 |
| 19 | 2552850 |
| 20 | 4956336 |
| 21 | 9622272 |
| 22 | 18681842 |
| 23 | 36269696 |
| 24 | 70416640 |
| 25 | 136712226 |
| 26 | 265421170 |
| 27 | 515308500 |
| 28 | 1000454184 |
| 29 | 1942349698 |
| 30 | 3771013664 |