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 | 21 |
| 7 | 124 |
| 8 | 636 |
| 9 | 2749 |
| 10 | 11265 |
| 11 | 44028 |
| 12 | 168673 |
| 13 | 636526 |
| 14 | 2385703 |
| 15 | 8903294 |
| 16 | 33177968 |
| 17 | 123602040 |
| 18 | 460821006 |
| 19 | 1720240295 |
| 20 | 6432225711 |
| 21 | 24095079682 |
| 22 | 90435264009 |
| 23 | 340097165156 |
| 24 | 1281506663877 |
| 25 | 4838093967400 |
| 26 | 18299480354681 |
| 27 | 69340086808691 |
| 28 | 263195643048634 |