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 | 9 |
| 4 | 60 |
| 5 | 361 |
| 6 | 2076 |
| 7 | 11672 |
| 8 | 64842 |
| 9 | 357897 |
| 10 | 1968788 |
| 11 | 10813804 |
| 12 | 59372770 |
| 13 | 326086492 |
| 14 | 1792293014 |
| 15 | 9861375614 |
| 16 | 54324086446 |
| 17 | 299651439321 |
| 18 | 1655124211372 |
| 19 | 9154654655044 |
| 20 | 50704627346170 |
| 21 | 281214708137032 |
| 22 | 1561706813618886 |