n | a(n) |
---|---|
0 | 2 |
1 | 6 |
2 | 16 |
3 | 46 |
4 | 132 |
5 | 376 |
6 | 1074 |
7 | 3066 |
8 | 8752 |
9 | 24986 |
10 | 71328 |
11 | 203624 |
12 | 581298 |
13 | 1659462 |
14 | 4737360 |
15 | 13524006 |
16 | 38607732 |
17 | 110215648 |
18 | 314638754 |
19 | 898216794 |
20 | 2564189568 |
21 | 7320134930 |
22 | 20897197344 |
23 | 59656394448 |
24 | 170304435554 |
25 | 486177568038 |
26 | 1387918211824 |
27 | 3962167507006 |
[2,6,16,46,132,376,1074,3066,8752,24986,71328, 203624,581298,1659462,4737360,13524006,38607732, 110215648,314638754,898216794,2564189568, 7320134930,20897197344,59656394448,170304435554, 486177568038,1387918211824,3962167507006] |