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 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 13 |
| 7 | 42 |
| 8 | 113 |
| 9 | 309 |
| 10 | 792 |
| 11 | 2049 |
| 12 | 5167 |
| 13 | 13071 |
| 14 | 32724 |
| 15 | 82006 |
| 16 | 204619 |
| 17 | 510655 |
| 18 | 1272101 |
| 19 | 3168971 |
| 20 | 7888446 |
| 21 | 19636642 |
| 22 | 48868367 |
| 23 | 121621466 |
| 24 | 302673515 |
| 25 | 753319709 |
| 26 | 1875049668 |
| 27 | 4667676111 |
| 28 | 11620911254 |
| 29 | 28936281066 |
| 30 | 72062264255 |