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) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 14 |
| 4 | 40 |
| 5 | 248 |
| 6 | 976 |
| 7 | 4928 |
| 8 | 21568 |
| 9 | 102272 |
| 10 | 463360 |
| 11 | 2153984 |
| 12 | 9868288 |
| 13 | 45584384 |
| 14 | 209588224 |
| 15 | 966189056 |
| 16 | 4447436800 |
| 17 | 20489142272 |
| 18 | 94347526144 |
| 19 | 434564759552 |
| 20 | 2001299832832 |
| 21 | 9217376780288 |
| 22 | 42450351554560 |
| 23 | 195509224472576 |