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) |
|---|---|
| 4 | 1 |
| 5 | 4 |
| 6 | 10 |
| 7 | 24 |
| 8 | 55 |
| 9 | 132 |
| 10 | 322 |
| 11 | 804 |
| 12 | 2051 |
| 13 | 5304 |
| 14 | 13886 |
| 15 | 36716 |
| 16 | 97882 |
| 17 | 262756 |
| 18 | 709658 |
| 19 | 1926748 |
| 20 | 5255707 |
| 21 | 14396048 |
| 22 | 39580338 |
| 23 | 109190052 |
| 24 | 302148814 |
| 25 | 838449236 |
| 26 | 2332652648 |
| 27 | 6505071080 |
| 28 | 18180441512 |
| 29 | 50914047384 |
| 30 | 142853059922 |
| 31 | 401517522844 |
| 32 | 1130400537667 |
| 33 | 3187335556064 |