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) |
|---|---|
| 6 | 1 |
| 7 | 2 |
| 8 | 8 |
| 9 | 23 |
| 10 | 74 |
| 11 | 220 |
| 12 | 674 |
| 13 | 2011 |
| 14 | 6038 |
| 15 | 17980 |
| 16 | 53547 |
| 17 | 158907 |
| 18 | 471225 |
| 19 | 1394786 |
| 20 | 4124929 |
| 21 | 12185636 |
| 22 | 35972082 |
| 23 | 106111713 |
| 24 | 312835608 |
| 25 | 921809509 |
| 26 | 2715058701 |
| 27 | 7993741597 |
| 28 | 23527694230 |
| 29 | 69228383367 |
| 30 | 203648980297 |
| 31 | 598945442071 |