n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 41 |
5 | 156 |
6 | 616 |
7 | 2395 |
8 | 9791 |
9 | 41089 |
10 | 171762 |
11 | 727439 |
12 | 3144822 |
13 | 13642362 |
14 | 59321761 |
15 | 260946859 |
16 | 1155680832 |
17 | 5123803967 |
18 | 22833022929 |
19 | 102400459379 |
20 | 460260024518 |
21 | 2073172012199 |
22 | 9379133327209 |
23 | 42558419134854 |
24 | 193388260313188 |
25 | 881001386618136 |
26 | 4024811098167125 |
27 | 18415926134123861 |
[1,1,4,12,41,156,616,2395,9791,41089,171762, 727439,3144822,13642362,59321761,260946859, 1155680832,5123803967,22833022929,102400459379, 460260024518,2073172012199,9379133327209, 42558419134854,193388260313188,881001386618136, 4024811098167125,18415926134123861] |