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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 36 |
| 6 | 80 |
| 7 | 194 |
| 8 | 506 |
| 9 | 1400 |
| 10 | 4024 |
| 11 | 11870 |
| 12 | 35200 |
| 13 | 104836 |
| 14 | 311686 |
| 15 | 929088 |
| 16 | 2776618 |
| 17 | 8321128 |
| 18 | 24967712 |
| 19 | 74985708 |