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) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 14 |
| 7 | 11 |
| 8 | 52 |
| 9 | 72 |
| 10 | 274 |
| 11 | 281 |
| 12 | 2155 |
| 13 | 1741 |
| 14 | 9650 |
| 15 | 20456 |
| 16 | 58071 |
| 17 | 79293 |
| 18 | 599452 |
| 19 | 566739 |
| 20 | 3668218 |
| 21 | 6931312 |
| 22 | 23776154 |
| 23 | 31008623 |
| 24 | 246109051 |
| 25 | 282422552 |
| 26 | 1357819070 |
| 27 | 2615067966 |
| 28 | 11358104142 |