n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 9 |
3 | 20 |
4 | 54 |
5 | 112 |
6 | 240 |
7 | 648 |
8 | 1344 |
9 | 2816 |
10 | 5760 |
11 | 12800 |
12 | 26624 |
13 | 62208 |
14 | 129024 |
15 | 270336 |
16 | 552960 |
17 | 1114112 |
18 | 2293760 |
19 | 4915200 |
20 | 9961472 |
21 | 20447232 |
22 | 47775744 |
23 | 96468992 |
24 | 198180864 |
25 | 411041792 |
26 | 830472192 |
27 | 1698693120 |
28 | 3422552064 |
29 | 7046430720 |
[1,3,9,20,54,112,240,648,1344,2816,5760,12800, 26624,62208,129024,270336,552960,1114112,2293760, 4915200,9961472,20447232,47775744,96468992, 198180864,411041792,830472192,1698693120, 3422552064,7046430720] |