n | a(n) |
---|---|
0 | 2 |
1 | 2 |
2 | 28 |
3 | 80 |
4 | 496 |
5 | 1952 |
6 | 9856 |
7 | 43136 |
8 | 204544 |
9 | 926720 |
10 | 4307968 |
11 | 19736576 |
12 | 91168768 |
13 | 419176448 |
14 | 1932378112 |
15 | 8894873600 |
16 | 40978284544 |
17 | 188695052288 |
18 | 869129519104 |
19 | 4002599665664 |
20 | 18434753560576 |
21 | 84900703109120 |
[2,2,28,80,496,1952,9856,43136,204544,926720, 4307968,19736576,91168768,419176448,1932378112, 8894873600,40978284544,188695052288,869129519104, 4002599665664,18434753560576,84900703109120] |