n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 8 |
6 | 32 |
7 | 168 |
8 | 616 |
9 | 2380 |
10 | 8464 |
11 | 30760 |
12 | 109612 |
13 | 394816 |
14 | 1420616 |
15 | 5149940 |
16 | 18736128 |
17 | 68553728 |
18 | 251899620 |
19 | 929814984 |
20 | 3445425136 |
21 | 12814382452 |
22 | 47817520376 |
23 | 178982546512 |
24 | 671813585080 |
25 | 2528191984496 |
26 | 9536849432000 |
[0,0,0,0,0,8,32,168,616,2380,8464,30760,109612, 394816,1420616,5149940,18736128,68553728, 251899620,929814984,3445425136,12814382452, 47817520376,178982546512,671813585080, 2528191984496,9536849432000] |