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 | 0 |
| 5 | 6 |
| 6 | 7 |
| 7 | 28 |
| 8 | 54 |
| 9 | 135 |
| 10 | 286 |
| 11 | 627 |
| 12 | 1313 |
| 13 | 2730 |
| 14 | 5565 |
| 15 | 11212 |
| 16 | 22304 |
| 17 | 43911 |
| 18 | 85614 |
| 19 | 165490 |
| 20 | 317373 |
| 21 | 604296 |
| 22 | 1143054 |
| 23 | 2149074 |
| 24 | 4017950 |
| 25 | 7473180 |
| 26 | 13832910 |
| 27 | 25490115 |
| 28 | 46774448 |
| 29 | 85494900 |
| 30 | 155693873 |
| 31 | 282551856 |
| 32 | 511101624 |
| 33 | 921676437 |
| 34 | 1657238030 |
| 35 | 2971622493 |
| 36 | 5314551351 |