n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 30 |
3 | 272 |
4 | 2737 |
5 | 29380 |
6 | 329614 |
7 | 3818540 |
8 | 45329440 |
9 | 548511612 |
10 | 6740687924 |
11 | 83898110660 |
12 | 1055441468145 |
13 | 13398494365088 |
14 | 171422870731600 |
15 | 2208161418665872 |
16 | 28614197357895055 |
17 | 372754395074051500 |
18 | 4878709294080115494 |
19 | 64123505084010848580 |
20 | 846018700129069313495 |
[1,4,30,272,2737,29380,329614,3818540,45329440, 548511612,6740687924,83898110660,1055441468145, 13398494365088,171422870731600,2208161418665872, 28614197357895055,372754395074051500, 4878709294080115494,64123505084010848580, 846018700129069313495] |