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 | 7 |
| 2 | 20 |
| 3 | 48 |
| 4 | 108 |
| 5 | 236 |
| 6 | 508 |
| 7 | 1084 |
| 8 | 2300 |
| 9 | 4860 |
| 10 | 10236 |
| 11 | 21500 |
| 12 | 45052 |
| 13 | 94204 |
| 14 | 196604 |
| 15 | 409596 |
| 16 | 851964 |
| 17 | 1769468 |
| 18 | 3670012 |
| 19 | 7602172 |
| 20 | 15728636 |
| 21 | 32505852 |
| 22 | 67108860 |
| 23 | 138412028 |
| 24 | 285212668 |
| 25 | 587202556 |
| 26 | 1207959548 |
| 27 | 2483027964 |
| 28 | 5100273660 |
| 29 | 10468982780 |
| 30 | 21474836476 |