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 | 2 |
| 2 | 3 |
| 3 | 6 |
| 4 | 14 |
| 5 | 36 |
| 6 | 94 |
| 7 | 246 |
| 8 | 645 |
| 9 | 1682 |
| 10 | 4367 |
| 11 | 11312 |
| 12 | 29261 |
| 13 | 75654 |
| 14 | 195607 |
| 15 | 505794 |
| 16 | 1307977 |
| 17 | 3382628 |
| 18 | 8748288 |
| 19 | 22625594 |
| 20 | 58516858 |
| 21 | 151343298 |
| 22 | 391422104 |
| 23 | 1012341602 |