n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 8 |
3 | 24 |
4 | 72 |
5 | 222 |
6 | 688 |
7 | 2128 |
8 | 6576 |
9 | 20322 |
10 | 62808 |
11 | 194120 |
12 | 599960 |
13 | 1854270 |
14 | 5730912 |
15 | 17712288 |
16 | 54742624 |
17 | 169190722 |
18 | 522910632 |
19 | 1616137848 |
20 | 4994929128 |
21 | 15437616926 |
22 | 47712391952 |
23 | 147462678768 |
24 | 455756685840 |
25 | 1408587979170 |
26 | 4353463496440 |
27 | 13455066133672 |
[0,2,8,24,72,222,688,2128,6576,20322,62808,194120, 599960,1854270,5730912,17712288,54742624, 169190722,522910632,1616137848,4994929128, 15437616926,47712391952,147462678768,455756685840, 1408587979170,4353463496440,13455066133672] |