n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 52 |
3 | 288 |
4 | 1396 |
5 | 6208 |
6 | 25744 |
7 | 100608 |
8 | 374500 |
9 | 1336488 |
10 | 4596000 |
11 | 15297056 |
12 | 49444368 |
13 | 155640640 |
14 | 478268800 |
15 | 1437600000 |
16 | 4234216836 |
17 | 12238666208 |
18 | 34761065924 |
19 | 97130259232 |
20 | 267280386128 |
21 | 724987680384 |
22 | 1940011007056 |
23 | 5125212451584 |
24 | 13376644454672 |
25 | 34512562565224 |
[1,8,52,288,1396,6208,25744,100608,374500,1336488, 4596000,15297056,49444368,155640640,478268800, 1437600000,4234216836,12238666208,34761065924, 97130259232,267280386128,724987680384, 1940011007056,5125212451584,13376644454672, 34512562565224] |