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 | 0 |
| 5 | 1 |
| 6 | 4 |
| 7 | 9 |
| 8 | 21 |
| 9 | 45 |
| 10 | 104 |
| 11 | 233 |
| 12 | 549 |
| 13 | 1299 |
| 14 | 3157 |
| 15 | 7739 |
| 16 | 19318 |
| 17 | 48627 |
| 18 | 123865 |
| 19 | 317953 |
| 20 | 823063 |
| 21 | 2144503 |
| 22 | 5623754 |
| 23 | 14828072 |
| 24 | 39299895 |
| 25 | 104636888 |
| 26 | 279793448 |
| 27 | 751065458 |
| 28 | 2023443030 |
| 29 | 5469566583 |
| 30 | 14830871800 |
| 31 | 40330829028 |
| 32 | 109972410219 |
| 33 | 300628862478 |
| 34 | 823779631719 |