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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 16 |
| 4 | 42 |
| 5 | 116 |
| 6 | 310 |
| 7 | 816 |
| 8 | 2121 |
| 9 | 5466 |
| 10 | 13937 |
| 11 | 35248 |
| 12 | 88494 |
| 13 | 220644 |
| 14 | 546778 |
| 15 | 1347344 |
| 16 | 3302780 |
| 17 | 8057344 |
| 18 | 19568892 |
| 19 | 47329264 |
| 20 | 114025786 |
| 21 | 273709732 |
| 22 | 654765342 |
| 23 | 1561257968 |
| 24 | 3711373005 |
| 25 | 8797021714 |
| 26 | 20794198581 |
| 27 | 49024480880 |
| 28 | 115292809910 |
| 29 | 270495295636 |