n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 0 |
4 | 6 |
5 | 24 |
6 | 90 |
7 | 1008 |
8 | 7560 |
9 | 54432 |
10 | 712152 |
11 | 7620480 |
12 | 81130896 |
13 | 1266632640 |
14 | 17587441872 |
15 | 246734377344 |
16 | 4527397929600 |
17 | 77238618702336 |
18 | 1340945212763520 |
19 | 28407941067018240 |
20 | 574640938744314624 |
21 | 11868502219930137600 |
22 | 285787326567523173120 |
[1,0,1,0,6,24,90,1008,7560,54432,712152,7620480, 81130896,1266632640,17587441872,246734377344, 4527397929600,77238618702336,1340945212763520, 28407941067018240,574640938744314624, 11868502219930137600,285787326567523173120] |