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 | 8 |
| 2 | 50 |
| 3 | 240 |
| 4 | 1024 |
| 5 | 3888 |
| 6 | 13696 |
| 7 | 44960 |
| 8 | 139970 |
| 9 | 414904 |
| 10 | 1181568 |
| 11 | 3242928 |
| 12 | 8623104 |
| 13 | 22268752 |
| 14 | 56039936 |
| 15 | 137686048 |
| 16 | 331039232 |
| 17 | 780029536 |
| 18 | 1804321074 |
| 19 | 4102056144 |
| 20 | 9177497600 |
| 21 | 20225408480 |
| 22 | 43948974720 |
| 23 | 94236510112 |
| 24 | 199549448704 |