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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 16 |
| 4 | 31 |
| 5 | 57 |
| 6 | 106 |
| 7 | 198 |
| 8 | 377 |
| 9 | 727 |
| 10 | 1420 |
| 11 | 2796 |
| 12 | 5539 |
| 13 | 11013 |
| 14 | 21950 |
| 15 | 43810 |
| 16 | 87517 |
| 17 | 174915 |
| 18 | 349696 |
| 19 | 699240 |
| 20 | 1398311 |
| 21 | 2796433 |
| 22 | 5592658 |
| 23 | 11185086 |
| 24 | 22369921 |
| 25 | 44739567 |
| 26 | 89478836 |
| 27 | 178957348 |
| 28 | 357914347 |
| 29 | 715828317 |
| 30 | 1431656230 |
| 31 | 2863312026 |