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 | 1 |
| 4 | 4 |
| 5 | 7 |
| 6 | 30 |
| 7 | 143 |
| 8 | 585 |
| 9 | 2420 |
| 10 | 9690 |
| 11 | 38779 |
| 12 | 153769 |
| 13 | 608925 |
| 14 | 2404100 |
| 15 | 9484317 |
| 16 | 37378622 |
| 17 | 147270615 |
| 18 | 580094570 |
| 19 | 2284987355 |
| 20 | 9001081353 |
| 21 | 35463025663 |
| 22 | 139747015800 |
| 23 | 550824207900 |
| 24 | 2171675252565 |
| 25 | 8564359325319 |
| 26 | 33784352403732 |