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) |
|---|---|
| 8 | 1 |
| 9 | 1 |
| 10 | 6 |
| 11 | 25 |
| 12 | 104 |
| 13 | 384 |
| 14 | 1380 |
| 15 | 4729 |
| 16 | 15806 |
| 17 | 51478 |
| 18 | 164788 |
| 19 | 519296 |
| 20 | 1617066 |
| 21 | 4983855 |
| 22 | 15233671 |
| 23 | 46235252 |
| 24 | 139506803 |
| 25 | 418838281 |
| 26 | 1252174861 |
| 27 | 3730058316 |
| 28 | 11077154790 |
| 29 | 32808815240 |
| 30 | 96953599162 |
| 31 | 285945645659 |
| 32 | 841909040785 |
| 33 | 2475184643011 |
| 34 | 7267678432397 |
| 35 | 21315839832323 |