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 | 3 |
| 2 | 8 |
| 3 | 22 |
| 4 | 60 |
| 5 | 164 |
| 6 | 448 |
| 7 | 1224 |
| 8 | 3344 |
| 9 | 9136 |
| 10 | 24960 |
| 11 | 68192 |
| 12 | 186304 |
| 13 | 508992 |
| 14 | 1390592 |
| 15 | 3799168 |
| 16 | 10379520 |
| 17 | 28357376 |
| 18 | 77473792 |
| 19 | 211662336 |
| 20 | 578272256 |
| 21 | 1579869184 |
| 22 | 4316282880 |
| 23 | 11792304128 |
| 24 | 32217174016 |
| 25 | 88018956288 |
| 26 | 240472260608 |
| 27 | 656982433792 |
| 28 | 1794909388800 |
| 29 | 4903783645184 |
| 30 | 13397386067968 |