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 | 10 |
| 4 | 37 |
| 5 | 118 |
| 6 | 361 |
| 7 | 1090 |
| 8 | 3277 |
| 9 | 9838 |
| 10 | 29521 |
| 11 | 88570 |
| 12 | 265717 |
| 13 | 797158 |
| 14 | 2391481 |
| 15 | 7174450 |
| 16 | 21523357 |
| 17 | 64570078 |
| 18 | 193710241 |
| 19 | 581130730 |
| 20 | 1743392197 |
| 21 | 5230176598 |
| 22 | 15690529801 |
| 23 | 47071589410 |
| 24 | 141214768237 |
| 25 | 423644304718 |
| 26 | 1270932914161 |