n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 240 |
4 | 2348 |
5 | 24952 |
6 | 280192 |
7 | 3271232 |
8 | 39310668 |
9 | 483032980 |
10 | 6041149272 |
11 | 76648727632 |
12 | 984161689728 |
13 | 12764078032568 |
14 | 166969699620640 |
15 | 2200415358484800 |
16 | 29186416580736300 |
17 | 389340777798701672 |
18 | 5220028320540100220 |
19 | 70303231772070200912 |
[1,4,28,240,2348,24952,280192,3271232,39310668, 483032980,6041149272,76648727632,984161689728, 12764078032568,166969699620640,2200415358484800, 29186416580736300,389340777798701672, 5220028320540100220,70303231772070200912] |