n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 2 |
7 | 12 |
8 | 70 |
9 | 448 |
10 | 3298 |
11 | 27490 |
12 | 255876 |
13 | 2631876 |
14 | 29652480 |
15 | 363242880 |
16 | 4807626352 |
17 | 68375130352 |
18 | 1040021719578 |
19 | 16848351857178 |
20 | 289631191449600 |
21 | 5266021662720000 |
22 | 100970241446066086 |
23 | 2036233202495666086 |
24 | 43086694564808294400 |
25 | 954536002666522214400 |
26 | 22095740802465792000000 |
[0,0,0,0,0,2,12,70,448,3298,27490,255876,2631876, 29652480,363242880,4807626352,68375130352, 1040021719578,16848351857178,289631191449600, 5266021662720000,100970241446066086, 2036233202495666086,43086694564808294400, 954536002666522214400,22095740802465792000000] |