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 | 10 |
| 3 | 64 |
| 4 | 328 |
| 5 | 1462 |
| 6 | 5908 |
| 7 | 22180 |
| 8 | 78592 |
| 9 | 265729 |
| 10 | 864146 |
| 11 | 2719028 |
| 12 | 8316200 |
| 13 | 24814832 |
| 14 | 72453344 |
| 15 | 207502016 |
| 16 | 584094080 |
| 17 | 1618757120 |
| 18 | 4423347200 |
| 19 | 11932579840 |
| 20 | 31812874240 |
| 21 | 83901227008 |
| 22 | 219074805760 |
| 23 | 566754967552 |