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 | 8 |
| 3 | 26 |
| 4 | 66 |
| 5 | 174 |
| 6 | 398 |
| 7 | 878 |
| 8 | 2174 |
| 9 | 4862 |
| 10 | 10494 |
| 11 | 22014 |
| 12 | 45054 |
| 13 | 98302 |
| 14 | 222718 |
| 15 | 480766 |
| 16 | 1021438 |
| 17 | 2127358 |
| 18 | 4355582 |
| 19 | 8943102 |
| 20 | 18773502 |
| 21 | 38696446 |
| 22 | 79590910 |
| 23 | 175142398 |
| 24 | 368080382 |
| 25 | 764442110 |
| 26 | 1586525694 |
| 27 | 3247470078 |
| 28 | 6644856318 |
| 29 | 13489960446 |