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) |
|---|---|
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 35 |
| 6 | 112 |
| 7 | 350 |
| 8 | 1087 |
| 9 | 3351 |
| 10 | 10286 |
| 11 | 31460 |
| 12 | 95966 |
| 13 | 292110 |
| 14 | 887629 |
| 15 | 2693423 |
| 16 | 8163367 |
| 17 | 24717575 |
| 18 | 74778718 |
| 19 | 226066940 |
| 20 | 683006416 |
| 21 | 2062412936 |
| 22 | 6224697139 |
| 23 | 18779180645 |
| 24 | 56633215930 |
| 25 | 170733734210 |
| 26 | 514559844007 |
| 27 | 1550364293145 |