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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 13 |
| 5 | 25 |
| 6 | 49 |
| 7 | 99 |
| 8 | 199 |
| 9 | 399 |
| 10 | 797 |
| 11 | 1593 |
| 12 | 3185 |
| 13 | 6371 |
| 14 | 12743 |
| 15 | 25487 |
| 16 | 50973 |
| 17 | 101945 |
| 18 | 203889 |
| 19 | 407779 |
| 20 | 815559 |
| 21 | 1631119 |
| 22 | 3262237 |
| 23 | 6524473 |
| 24 | 13048945 |
| 25 | 26097891 |
| 26 | 52195783 |
| 27 | 104391567 |
| 28 | 208783133 |
| 29 | 417566265 |
| 30 | 835132529 |
| 31 | 1670265059 |
| 32 | 3340530119 |
| 33 | 6681060239 |