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 | 7 |
| 3 | 15 |
| 4 | 32 |
| 5 | 66 |
| 6 | 139 |
| 7 | 285 |
| 8 | 599 |
| 9 | 1227 |
| 10 | 2577 |
| 11 | 5277 |
| 12 | 11075 |
| 13 | 22671 |
| 14 | 47543 |
| 15 | 97287 |
| 16 | 203860 |
| 17 | 417006 |
| 18 | 873175 |
| 19 | 1785513 |
| 20 | 3736210 |
| 21 | 7637604 |
| 22 | 15972143 |
| 23 | 32641221 |
| 24 | 68224004 |
| 25 | 139389570 |
| 26 | 291199307 |
| 27 | 594818781 |
| 28 | 1242097912 |
| 29 | 2536656174 |