n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 19 |
3 | 104 |
4 | 440 |
5 | 1600 |
6 | 5264 |
7 | 16128 |
8 | 46848 |
9 | 130560 |
10 | 352000 |
11 | 923648 |
12 | 2369536 |
13 | 5963776 |
14 | 14766080 |
15 | 36044800 |
16 | 86900736 |
17 | 207224832 |
18 | 489357312 |
19 | 1145569280 |
20 | 2660761600 |
21 | 6136266752 |
22 | 14060355584 |
23 | 32027705344 |
24 | 72561459200 |
25 | 163577856000 |
26 | 367068708864 |
27 | 820204535808 |
[0,2,19,104,440,1600,5264,16128,46848,130560, 352000,923648,2369536,5963776,14766080,36044800, 86900736,207224832,489357312,1145569280, 2660761600,6136266752,14060355584,32027705344, 72561459200,163577856000,367068708864, 820204535808] |