n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 8 |
6 | 50 |
7 | 54 |
8 | 284 |
9 | 525 |
10 | 2370 |
11 | 2872 |
12 | 22748 |
13 | 21866 |
14 | 131750 |
15 | 298792 |
16 | 904918 |
17 | 1341518 |
18 | 10745090 |
19 | 10748218 |
20 | 72889084 |
21 | 145274556 |
22 | 522819590 |
23 | 713023210 |
24 | 5892634240 |
25 | 7059926605 |
26 | 35300985550 |
27 | 70604008204 |
[0,0,1,4,8,50,54,284,525,2370,2872,22748,21866, 131750,298792,904918,1341518,10745090,10748218, 72889084,145274556,522819590,713023210,5892634240, 7059926605,35300985550,70604008204] |