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) |
|---|---|
| 5 | 1 |
| 6 | 6 |
| 7 | 27 |
| 8 | 104 |
| 9 | 369 |
| 10 | 1242 |
| 11 | 4037 |
| 12 | 12804 |
| 13 | 39897 |
| 14 | 122694 |
| 15 | 373581 |
| 16 | 1128816 |
| 17 | 3390582 |
| 18 | 10136556 |
| 19 | 30192102 |
| 20 | 89662216 |
| 21 | 265640691 |
| 22 | 785509362 |
| 23 | 2319218869 |
| 24 | 6839057544 |
| 25 | 20147488020 |
| 26 | 59306494520 |
| 27 | 174466248840 |
| 28 | 512987904000 |
| 29 | 1507780192035 |
| 30 | 4430417492826 |
| 31 | 13015498076181 |