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 | 14 |
| 3 | 44 |
| 4 | 124 |
| 5 | 328 |
| 6 | 824 |
| 7 | 1980 |
| 8 | 4590 |
| 9 | 10320 |
| 10 | 22584 |
| 11 | 48268 |
| 12 | 101016 |
| 13 | 207432 |
| 14 | 418704 |
| 15 | 832032 |
| 16 | 1629764 |
| 17 | 3150280 |
| 18 | 6014998 |
| 19 | 11354084 |
| 20 | 21204488 |
| 21 | 39206168 |
| 22 | 71811256 |
| 23 | 130369900 |
| 24 | 234704360 |
| 25 | 419195412 |
| 26 | 743085912 |
| 27 | 1307823672 |
| 28 | 2286094704 |
| 29 | 3970174648 |
| 30 | 6852048368 |