n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 6 |
4 | 12 |
5 | 40 |
6 | 2340 |
7 | 18648 |
8 | 154560 |
9 | 5767200 |
10 | 95911200 |
11 | 1438778880 |
12 | 48014778240 |
13 | 1228487644800 |
14 | 27997623029376 |
15 | 972327510000000 |
16 | 32550437645107200 |
17 | 1006902423902269440 |
18 | 38894136241736494080 |
19 | 1569697954634035537920 |
20 | 61093442927846310912000 |
[1,0,0,6,12,40,2340,18648,154560,5767200,95911200, 1438778880,48014778240,1228487644800, 27997623029376,972327510000000,32550437645107200, 1006902423902269440,38894136241736494080, 1569697954634035537920,61093442927846310912000] |