n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 3 |
4 | 6 |
5 | 0 |
6 | 12 |
7 | 106 |
8 | 420 |
9 | 2718 |
10 | 18240 |
11 | 120879 |
12 | 694320 |
13 | 5430438 |
14 | 40668264 |
15 | 300401818 |
16 | 2369504386 |
17 | 19928714475 |
18 | 174151735920 |
19 | 1543284732218 |
20 | 14224347438876 |
21 | 135649243229688 |
22 | 1331658133954940 |
23 | 13369350846412794 |
24 | 138122850643702056 |
25 | 1462610254141337590 |
[1,1,0,3,6,0,12,106,420,2718,18240,120879,694320, 5430438,40668264,300401818,2369504386,19928714475, 174151735920,1543284732218,14224347438876, 135649243229688,1331658133954940, 13369350846412794,138122850643702056, 1462610254141337590] |