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 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 20 |
| 6 | 51 |
| 7 | 112 |
| 8 | 221 |
| 9 | 411 |
| 10 | 720 |
| 11 | 1221 |
| 12 | 2003 |
| 13 | 3206 |
| 14 | 5021 |
| 15 | 7728 |
| 16 | 11698 |
| 17 | 17472 |
| 18 | 25766 |
| 19 | 37580 |
| 20 | 54254 |
| 21 | 77617 |
| 22 | 110087 |
| 23 | 154942 |
| 24 | 216488 |
| 25 | 300456 |
| 26 | 414365 |
| 27 | 568113 |
| 28 | 774571 |
| 29 | 1050572 |
| 30 | 1417868 |
| 31 | 1904641 |
| 32 | 2547152 |
| 33 | 3392042 |
| 34 | 4498948 |
| 35 | 5944158 |
| 36 | 7824703 |
| 37 | 10263932 |
| 38 | 13418043 |
| 39 | 17484554 |