n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 14 |
4 | 94 |
5 | 684 |
6 | 5508 |
7 | 49104 |
8 | 482256 |
9 | 5185440 |
10 | 60668640 |
11 | 767940480 |
12 | 10462227840 |
13 | 152698210560 |
14 | 2377651449600 |
15 | 39350097561600 |
16 | 689874448435200 |
17 | 12773427499929600 |
18 | 249097496204390400 |
19 | 5103595024496640000 |
20 | 109608397522606080000 |
21 | 2462475687669043200000 |
[0,2,14,94,684,5508,49104,482256,5185440,60668640, 767940480,10462227840,152698210560,2377651449600, 39350097561600,689874448435200,12773427499929600, 249097496204390400,5103595024496640000, 109608397522606080000,2462475687669043200000] |