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 | 6 |
| 2 | 17 |
| 3 | 41 |
| 4 | 93 |
| 5 | 205 |
| 6 | 445 |
| 7 | 957 |
| 8 | 2045 |
| 9 | 4349 |
| 10 | 9213 |
| 11 | 19453 |
| 12 | 40957 |
| 13 | 86013 |
| 14 | 180221 |
| 15 | 376829 |
| 16 | 786429 |
| 17 | 1638397 |
| 18 | 3407869 |
| 19 | 7077885 |
| 20 | 14680061 |
| 21 | 30408701 |
| 22 | 62914557 |
| 23 | 130023421 |
| 24 | 268435453 |
| 25 | 553648125 |
| 26 | 1140850685 |
| 27 | 2348810237 |
| 28 | 4831838205 |
| 29 | 9932111869 |
| 30 | 20401094653 |
| 31 | 41875931133 |