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 | 2 |
| 2 | 8 |
| 3 | 40 |
| 4 | 80 |
| 5 | 9232 |
| 6 | 9232 |
| 7 | 3280 |
| 8 | 6560 |
| 9 | 29524 |
| 10 | 59048 |
| 11 | 1276936 |
| 12 | 1276936 |
| 13 | 6810136 |
| 14 | 6810136 |
| 15 | 21523360 |
| 16 | 43046720 |
| 17 | 1570824736 |
| 18 | 1570824736 |
| 19 | 1743392200 |
| 20 | 3486784400 |
| 21 | 17651846032 |
| 22 | 31381059608 |
| 23 | 141214768240 |
| 24 | 282429536480 |
| 25 | 9161049517720 |