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 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 24 |
| 6 | 98 |
| 7 | 344 |
| 8 | 1236 |
| 9 | 5332 |
| 10 | 23772 |
| 11 | 110962 |
| 12 | 547714 |
| 13 | 2840028 |
| 14 | 15439466 |
| 15 | 87299850 |
| 16 | 512569668 |
| 17 | 3111575102 |
| 18 | 19577613014 |
| 19 | 127331688104 |
| 20 | 852129210498 |
| 21 | 5853657714546 |
| 22 | 41377621755100 |
| 23 | 300511333393982 |
| 24 | 2233952140321104 |