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 | 1 |
| 2 | 6 |
| 3 | 30 |
| 4 | 115 |
| 5 | 374 |
| 6 | 1079 |
| 7 | 2848 |
| 8 | 7005 |
| 9 | 16285 |
| 10 | 36117 |
| 11 | 76981 |
| 12 | 158563 |
| 13 | 317014 |
| 14 | 617349 |
| 15 | 1174400 |
| 16 | 2187584 |
| 17 | 3998057 |
| 18 | 7181362 |
| 19 | 12696179 |
| 20 | 22120549 |
| 21 | 38023748 |
| 22 | 64546190 |
| 23 | 108296742 |
| 24 | 179729895 |
| 25 | 295244362 |
| 26 | 480358370 |
| 27 | 774483006 |
| 28 | 1238052200 |