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 | 3 |
| 3 | 12 |
| 4 | 38 |
| 5 | 110 |
| 6 | 302 |
| 7 | 806 |
| 8 | 2109 |
| 9 | 5450 |
| 10 | 13917 |
| 11 | 35224 |
| 12 | 88464 |
| 13 | 220608 |
| 14 | 546734 |
| 15 | 1347290 |
| 16 | 3302716 |
| 17 | 8057268 |
| 18 | 19568800 |
| 19 | 47329156 |
| 20 | 114025658 |
| 21 | 273709580 |
| 22 | 654765164 |
| 23 | 1561257760 |
| 24 | 3711372761 |
| 25 | 8797021430 |
| 26 | 20794198251 |
| 27 | 49024480496 |
| 28 | 115292809466 |
| 29 | 270495295124 |
| 30 | 633186396954 |