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 | 1 |
| 2 | 3 |
| 3 | 8 |
| 4 | 24 |
| 5 | 75 |
| 6 | 237 |
| 7 | 755 |
| 8 | 2421 |
| 9 | 7804 |
| 10 | 25264 |
| 11 | 82081 |
| 12 | 267487 |
| 13 | 873970 |
| 14 | 2862038 |
| 15 | 9391137 |
| 16 | 30869167 |
| 17 | 101627704 |
| 18 | 335049772 |
| 19 | 1106003560 |
| 20 | 3655124296 |
| 21 | 12092095945 |
| 22 | 40042017815 |
| 23 | 132712302538 |
| 24 | 440207294382 |
| 25 | 1461259979347 |
| 26 | 4853983051617 |
| 27 | 16134233746913 |
| 28 | 53660996850207 |