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) |
|---|---|
| 4 | 10 |
| 5 | 15 |
| 6 | 29 |
| 7 | 63 |
| 8 | 149 |
| 9 | 375 |
| 10 | 989 |
| 11 | 2703 |
| 12 | 7589 |
| 13 | 21735 |
| 14 | 63149 |
| 15 | 185343 |
| 16 | 547829 |
| 17 | 1627095 |
| 18 | 4848509 |
| 19 | 14479983 |
| 20 | 43308869 |
| 21 | 129664455 |
| 22 | 388469069 |
| 23 | 1164358623 |
| 24 | 3490978709 |
| 25 | 10468741815 |
| 26 | 31397836829 |
| 27 | 94176733263 |
| 28 | 282496645349 |
| 29 | 847422827175 |
| 30 | 2542134263789 |
| 31 | 7626134355903 |