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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 9 |
| 5 | 26 |
| 6 | 75 |
| 7 | 214 |
| 8 | 612 |
| 9 | 1747 |
| 10 | 4995 |
| 11 | 14294 |
| 12 | 40967 |
| 13 | 117560 |
| 14 | 337830 |
| 15 | 972027 |
| 16 | 2800210 |
| 17 | 8075889 |
| 18 | 23315775 |
| 19 | 67380458 |
| 20 | 194901273 |
| 21 | 564239262 |
| 22 | 1634763697 |
| 23 | 4739866803 |
| 24 | 13752309730 |
| 25 | 39926751310 |
| 26 | 115988095896 |
| 27 | 337138003197 |