n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 132 |
4 | 3156 |
5 | 136980 |
6 | 10015092 |
7 | 1199364852 |
8 | 234207001236 |
9 | 75018740661780 |
10 | 39745330657406772 |
11 | 35073541377640231092 |
12 | 51798833078501480220756 |
13 | 128412490016744675540378580 |
14 | 535348496386845235339961362932 |
15 | 3757366291145650829115977555259252 |
[1,4,12,132,3156,136980,10015092,1199364852, 234207001236,75018740661780,39745330657406772, 35073541377640231092,51798833078501480220756, 128412490016744675540378580, 535348496386845235339961362932, 3757366291145650829115977555259252] |