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 | 3 |
| 5 | 9 |
| 6 | 19 |
| 7 | 41 |
| 8 | 77 |
| 9 | 142 |
| 10 | 247 |
| 11 | 421 |
| 12 | 689 |
| 13 | 1113 |
| 14 | 1750 |
| 15 | 2712 |
| 16 | 4128 |
| 17 | 6208 |
| 18 | 9201 |
| 19 | 13502 |
| 20 | 19585 |
| 21 | 28158 |
| 22 | 40109 |
| 23 | 56689 |
| 24 | 79486 |
| 25 | 110703 |
| 26 | 153129 |
| 27 | 210536 |
| 28 | 287752 |
| 29 | 391172 |
| 30 | 528961 |
| 31 | 711837 |
| 32 | 953429 |
| 33 | 1271421 |
| 34 | 1688293 |
| 35 | 2232899 |
| 36 | 2941798 |
| 37 | 3861621 |
| 38 | 5051174 |
| 39 | 6584958 |
| 40 | 8556655 |