n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 4 |
5 | 10 |
6 | 20 |
7 | 35 |
8 | 616 |
9 | 5124 |
10 | 29520 |
11 | 138765 |
12 | 942700 |
13 | 9369646 |
14 | 91711984 |
15 | 782281955 |
16 | 6539493520 |
17 | 62576274440 |
18 | 693828386976 |
19 | 7968383514969 |
20 | 89851862221140 |
21 | 1023732374445970 |
22 | 12384993316732960 |
23 | 160496534000858671 |
24 | 2163244034675904664 |
25 | 29653387436468336300 |
[1,0,0,0,4,10,20,35,616,5124,29520,138765,942700, 9369646,91711984,782281955,6539493520,62576274440, 693828386976,7968383514969,89851862221140, 1023732374445970,12384993316732960, 160496534000858671,2163244034675904664, 29653387436468336300] |