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) |
|---|---|
| 4 | 108 |
| 5 | 6180 |
| 6 | 83952 |
| 7 | 601944 |
| 8 | 2991576 |
| 9 | 11662056 |
| 10 | 38167920 |
| 11 | 109368864 |
| 12 | 282174948 |
| 13 | 668565612 |
| 14 | 1475938464 |
| 15 | 3069513720 |
| 16 | 6065522736 |
| 17 | 11466274512 |
| 18 | 20850952608 |
| 19 | 36639176832 |
| 20 | 62447999580 |
| 21 | 103567126068 |
| 22 | 167581781136 |
| 23 | 265177823064 |
| 24 | 411169457160 |
| 25 | 625796259000 |