n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 10 |
5 | 26 |
6 | 276 |
7 | 1212 |
8 | 14736 |
9 | 92304 |
10 | 1285920 |
11 | 10516320 |
12 | 166112640 |
13 | 1680462720 |
14 | 29753498880 |
15 | 359124192000 |
16 | 7053661440000 |
17 | 98989454592000 |
18 | 2137497610752000 |
19 | 34210080898560000 |
20 | 805846718380032000 |
21 | 14489879077804032000 |
22 | 369868281883398144000 |
[1,0,1,1,10,26,276,1212,14736,92304,1285920, 10516320,166112640,1680462720,29753498880, 359124192000,7053661440000,98989454592000, 2137497610752000,34210080898560000, 805846718380032000,14489879077804032000, 369868281883398144000] |