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 | 3 |
| 2 | 8 |
| 3 | 19 |
| 4 | 41 |
| 5 | 117 |
| 6 | 254 |
| 7 | 616 |
| 8 | 1642 |
| 9 | 3766 |
| 10 | 9461 |
| 11 | 24183 |
| 12 | 60252 |
| 13 | 151368 |
| 14 | 385600 |
| 15 | 979844 |
| 16 | 2507393 |
| 17 | 6428977 |
| 18 | 16513542 |
| 19 | 42642649 |
| 20 | 110283280 |
| 21 | 285776799 |
| 22 | 742428731 |
| 23 | 1932223170 |
| 24 | 5038580446 |
| 25 | 13159683245 |
| 26 | 34423463648 |
| 27 | 90173540312 |