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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 25 |
| 5 | 61 |
| 6 | 219 |
| 7 | 547 |
| 8 | 1937 |
| 9 | 4921 |
| 10 | 17203 |
| 11 | 44287 |
| 12 | 153193 |
| 13 | 398581 |
| 14 | 1366795 |
| 15 | 3587227 |
| 16 | 12211873 |
| 17 | 32285041 |
| 18 | 109226595 |
| 19 | 290565367 |
| 20 | 977773625 |
| 21 | 2615088301 |
| 22 | 8758657339 |
| 23 | 23535794707 |
| 24 | 78500250929 |
| 25 | 211822152361 |
| 26 | 703877909907 |
| 27 | 1906399371247 |
| 28 | 6313707508105 |
| 29 | 17157594341221 |
| 30 | 56650974993259 |