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 | 3 |
| 2 | 5 |
| 3 | 8 |
| 4 | 15 |
| 5 | 27 |
| 6 | 60 |
| 7 | 123 |
| 8 | 285 |
| 9 | 648 |
| 10 | 1529 |
| 11 | 3603 |
| 12 | 8680 |
| 13 | 20883 |
| 14 | 50825 |
| 15 | 124056 |
| 16 | 304575 |
| 17 | 750123 |
| 18 | 1855100 |
| 19 | 4600203 |
| 20 | 11442087 |
| 21 | 28527448 |
| 22 | 71292605 |
| 23 | 178526883 |
| 24 | 447919420 |
| 25 | 1125750147 |
| 26 | 2833906685 |
| 27 | 7144450568 |
| 28 | 18036423975 |
| 29 | 45591631803 |
| 30 | 115381823348 |