n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 20 |
3 | 96 |
4 | 480 |
5 | 2368 |
6 | 11840 |
7 | 58880 |
8 | 294400 |
9 | 1468416 |
10 | 7342080 |
11 | 36667392 |
12 | 183336960 |
13 | 916144128 |
14 | 4580720640 |
15 | 22896574464 |
16 | 114482872320 |
17 | 572320645120 |
18 | 2861603225600 |
19 | 14306741583872 |
20 | 71533707919360 |
21 | 357650927714304 |
22 | 1788254638571520 |
23 | 8941026626502656 |
24 | 44705133132513280 |
25 | 223522175800311808 |
[1,4,20,96,480,2368,11840,58880,294400,1468416, 7342080,36667392,183336960,916144128,4580720640, 22896574464,114482872320,572320645120, 2861603225600,14306741583872,71533707919360, 357650927714304,1788254638571520,8941026626502656, 44705133132513280,223522175800311808] |