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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 14 |
| 6 | 33 |
| 7 | 81 |
| 8 | 204 |
| 9 | 526 |
| 10 | 1376 |
| 11 | 3648 |
| 12 | 9792 |
| 13 | 26485 |
| 14 | 72233 |
| 15 | 198192 |
| 16 | 546846 |
| 17 | 1515687 |
| 18 | 4218564 |
| 19 | 11782427 |
| 20 | 33013541 |
| 21 | 92759384 |
| 22 | 261290682 |
| 23 | 737688946 |
| 24 | 2086993034 |
| 25 | 5915398230 |
| 26 | 16795618221 |
| 27 | 47763406249 |
| 28 | 136028420723 |
| 29 | 387928330677 |
| 30 | 1107692471888 |
| 31 | 3166613486137 |