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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 35 |
| 7 | 73 |
| 8 | 152 |
| 9 | 316 |
| 10 | 659 |
| 11 | 1376 |
| 12 | 2875 |
| 13 | 6004 |
| 14 | 12535 |
| 15 | 26173 |
| 16 | 54654 |
| 17 | 114134 |
| 18 | 238348 |
| 19 | 497743 |
| 20 | 1039432 |
| 21 | 2170634 |
| 22 | 4532949 |
| 23 | 9466295 |
| 24 | 19768943 |
| 25 | 41284768 |
| 26 | 86218046 |
| 27 | 180056039 |
| 28 | 376025957 |
| 29 | 785286555 |
| 30 | 1639979712 |
| 31 | 3424906290 |