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 | 32 |
| 6 | 64 |
| 7 | 127 |
| 8 | 252 |
| 9 | 500 |
| 10 | 992 |
| 11 | 1968 |
| 12 | 3904 |
| 13 | 7744 |
| 14 | 15361 |
| 15 | 30470 |
| 16 | 60440 |
| 17 | 119888 |
| 18 | 237808 |
| 19 | 471712 |
| 20 | 935680 |
| 21 | 1855999 |
| 22 | 3681528 |
| 23 | 7302616 |
| 24 | 14485344 |
| 25 | 28732880 |
| 26 | 56994048 |
| 27 | 113052416 |
| 28 | 224248833 |
| 29 | 444816138 |
| 30 | 882329660 |