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 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 14 |
| 6 | 37 |
| 7 | 74 |
| 8 | 177 |
| 9 | 354 |
| 10 | 807 |
| 11 | 1614 |
| 12 | 3579 |
| 13 | 7158 |
| 14 | 15591 |
| 15 | 31182 |
| 16 | 67071 |
| 17 | 134142 |
| 18 | 285861 |
| 19 | 571722 |
| 20 | 1209641 |
| 21 | 2419282 |
| 22 | 5089517 |
| 23 | 10179034 |
| 24 | 21314453 |
| 25 | 42628906 |
| 26 | 88918353 |
| 27 | 177836706 |
| 28 | 369734553 |
| 29 | 739469106 |
| 30 | 1533115953 |
| 31 | 3066231906 |
| 32 | 6341759073 |
| 33 | 12683518146 |