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 | 5 |
| 2 | 22 |
| 3 | 92 |
| 4 | 376 |
| 5 | 1520 |
| 6 | 6112 |
| 7 | 24512 |
| 8 | 98176 |
| 9 | 392960 |
| 10 | 1572352 |
| 11 | 6290432 |
| 12 | 25163776 |
| 13 | 100659200 |
| 14 | 402644992 |
| 15 | 1610596352 |
| 16 | 6442418176 |
| 17 | 25769738240 |
| 18 | 103079084032 |
| 19 | 412316598272 |
| 20 | 1649266917376 |
| 21 | 6597068718080 |
| 22 | 26388276969472 |
| 23 | 105553112072192 |
| 24 | 422212456677376 |