n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 4 |
4 | 6 |
5 | 14 |
6 | 40 |
7 | 56 |
8 | 100 |
9 | 332 |
10 | 1200 |
11 | 1696 |
12 | 7000 |
13 | 30514 |
14 | 146344 |
15 | 327236 |
16 | 566792 |
17 | 3052270 |
18 | 16994324 |
19 | 24033604 |
20 | 146190716 |
21 | 936077324 |
22 | 6138269514 |
23 | 42081855636 |
24 | 111338124722 |
25 | 810553782854 |
26 | 6225981742592 |
27 | 48626471887292 |
28 | 68768216033362 |
29 | 562892107725410 |
30 | 4743013205833238 |
[0,2,4,6,14,40,56,100,332,1200,1696,7000,30514, 146344,327236,566792,3052270,16994324,24033604, 146190716,936077324,6138269514,42081855636, 111338124722,810553782854,6225981742592, 48626471887292,68768216033362,562892107725410, 4743013205833238] |