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) |
|---|---|
| 3 | 1 |
| 4 | 14 |
| 5 | 102 |
| 6 | 561 |
| 7 | 2563 |
| 8 | 10285 |
| 9 | 37349 |
| 10 | 125290 |
| 11 | 393635 |
| 12 | 1170297 |
| 13 | 3317941 |
| 14 | 9025118 |
| 15 | 23667102 |
| 16 | 60070724 |
| 17 | 148055380 |
| 18 | 355322825 |
| 19 | 832286510 |
| 20 | 1906535024 |
| 21 | 4278519421 |
| 22 | 9420605029 |
| 23 | 20378915733 |
| 24 | 43362534963 |
| 25 | 90852676817 |
| 26 | 187612056437 |