n | a(n) |
---|---|
1 | 2 |
2 | 10 |
3 | 68 |
4 | 464 |
5 | 3168 |
6 | 21632 |
7 | 147712 |
8 | 1008640 |
9 | 6887424 |
10 | 47030272 |
11 | 321142784 |
12 | 2192900096 |
13 | 14974058496 |
14 | 102249267200 |
15 | 698201669632 |
16 | 4767619219456 |
17 | 32555340398592 |
18 | 222301769433088 |
19 | 1517971432275968 |
20 | 10365357302743040 |
[2,10,68,464,3168,21632,147712,1008640,6887424, 47030272,321142784,2192900096,14974058496, 102249267200,698201669632,4767619219456, 32555340398592,222301769433088,1517971432275968, 10365357302743040] |