n | a(n) |
---|---|
2 | 1 |
3 | 8 |
4 | 49 |
5 | 272 |
6 | 1440 |
7 | 7428 |
8 | 37730 |
9 | 189808 |
10 | 948909 |
11 | 4724160 |
12 | 23453001 |
13 | 116207424 |
14 | 575036475 |
15 | 2842936320 |
16 | 14046869575 |
17 | 69378730880 |
18 | 342590699955 |
19 | 1691519468760 |
20 | 8351553940355 |
21 | 41235710124400 |
22 | 203617691311370 |
23 | 1005560117623204 |
[1,8,49,272,1440,7428,37730,189808,948909,4724160, 23453001,116207424,575036475,2842936320, 14046869575,69378730880,342590699955, 1691519468760,8351553940355,41235710124400, 203617691311370,1005560117623204] |