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) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 7 |
| 5 | 28 |
| 6 | 124 |
| 7 | 588 |
| 8 | 2938 |
| 9 | 15266 |
| 10 | 81770 |
| 11 | 448698 |
| 12 | 2510813 |
| 13 | 14277838 |
| 14 | 82286365 |
| 15 | 479610362 |
| 16 | 2822332127 |
| 17 | 16745262798 |