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) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 6 |
| 4 | 8 |
| 5 | 13 |
| 6 | 22 |
| 7 | 37 |
| 8 | 64 |
| 9 | 114 |
| 10 | 205 |
| 11 | 373 |
| 12 | 683 |
| 13 | 1261 |
| 14 | 2341 |
| 15 | 4370 |
| 16 | 8192 |
| 17 | 15421 |
| 18 | 29128 |
| 19 | 55189 |
| 20 | 104858 |
| 21 | 199729 |
| 22 | 381301 |
| 23 | 729445 |
| 24 | 1398102 |
| 25 | 2684355 |
| 26 | 5162221 |
| 27 | 9942054 |
| 28 | 19173962 |
| 29 | 37025581 |
| 30 | 71582789 |
| 31 | 138547333 |
| 32 | 268435456 |
| 33 | 520602097 |