n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 40 |
5 | 149 |
6 | 560 |
7 | 2135 |
8 | 8355 |
9 | 33259 |
10 | 133255 |
11 | 538825 |
12 | 2200026 |
13 | 9034022 |
14 | 37274431 |
15 | 154600734 |
16 | 644062873 |
17 | 2692163743 |
18 | 11289636850 |
19 | 47490421438 |
20 | 200293595870 |
21 | 846706012593 |
22 | 3587270304952 |
23 | 15229272818359 |
24 | 64770883633813 |
25 | 275939465431865 |
26 | 1177442622478762 |
27 | 5031536426507492 |
[1,1,4,12,40,149,560,2135,8355,33259,133255, 538825,2200026,9034022,37274431,154600734, 644062873,2692163743,11289636850,47490421438, 200293595870,846706012593,3587270304952, 15229272818359,64770883633813,275939465431865, 1177442622478762,5031536426507492] |