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 | 4 |
| 2 | 7 |
| 3 | 19 |
| 4 | 28 |
| 5 | 64 |
| 6 | 91 |
| 7 | 199 |
| 8 | 280 |
| 9 | 604 |
| 10 | 847 |
| 11 | 1819 |
| 12 | 2548 |
| 13 | 5464 |
| 14 | 7651 |
| 15 | 16399 |
| 16 | 22960 |
| 17 | 49204 |
| 18 | 68887 |
| 19 | 147619 |
| 20 | 206668 |
| 21 | 442864 |
| 22 | 620011 |
| 23 | 1328599 |
| 24 | 1860040 |
| 25 | 3985804 |
| 26 | 5580127 |
| 27 | 11957419 |
| 28 | 16740388 |
| 29 | 35872264 |
| 30 | 50221171 |
| 31 | 107616799 |
| 32 | 150663520 |
| 33 | 322850404 |