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) |
|---|---|
| 0 | 1 |
| 1 | 24 |
| 2 | 145 |
| 3 | 459 |
| 4 | 1063 |
| 5 | 1522 |
| 6 | 2585 |
| 7 | 9277 |
| 8 | 11862 |
| 9 | 21139 |
| 10 | 33001 |
| 11 | 318148 |
| 12 | 351149 |
| 13 | 1371595 |
| 14 | 1722744 |
| 15 | 3094339 |
| 16 | 4817083 |
| 17 | 22362671 |
| 18 | 27179754 |
| 19 | 103901933 |
| 20 | 131081687 |
| 21 | 3643107482 |
| 22 | 3774189169 |
| 23 | 14965674989 |
| 24 | 78602564114 |
| 25 | 93568239103 |
| 26 | 265739042320 |
| 27 | 890785366063 |
| 28 | 37678724416966 |
| 29 | 339999305118757 |
| 30 | 377678029535723 |