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 | 6 |
| 3 | 11 |
| 4 | 21 |
| 5 | 38 |
| 6 | 88 |
| 7 | 188 |
| 8 | 377 |
| 9 | 735 |
| 10 | 1557 |
| 11 | 3288 |
| 12 | 6781 |
| 13 | 13628 |
| 14 | 28203 |
| 15 | 58716 |
| 16 | 121753 |
| 17 | 248505 |
| 18 | 511788 |
| 19 | 1057997 |
| 20 | 2191020 |
| 21 | 4502367 |
| 22 | 9272331 |
| 23 | 19120457 |
| 24 | 39518063 |
| 25 | 81408758 |
| 26 | 167766247 |
| 27 | 345763679 |
| 28 | 713697958 |
| 29 | 1471345608 |
| 30 | 3033391563 |
| 31 | 6252203749 |