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 | 7 |
| 2 | 43 |
| 3 | 245 |
| 4 | 1328 |
| 5 | 6944 |
| 6 | 35328 |
| 7 | 175872 |
| 8 | 860160 |
| 9 | 4145152 |
| 10 | 19726336 |
| 11 | 92864512 |
| 12 | 433061888 |
| 13 | 2002780160 |
| 14 | 9193914368 |
| 15 | 41926262784 |
| 16 | 190052302848 |
| 17 | 856845975552 |
| 18 | 3843995729920 |
| 19 | 17166984282112 |
| 20 | 76347338653696 |
| 21 | 338237264494592 |
| 22 | 1493136790519808 |
| 23 | 6569581975961600 |
| 24 | 28816000740753408 |