n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 16 |
4 | 48 |
5 | 136 |
6 | 408 |
7 | 1184 |
8 | 3552 |
9 | 10432 |
10 | 31296 |
11 | 92544 |
12 | 277632 |
13 | 824448 |
14 | 2473344 |
15 | 7365120 |
16 | 22095360 |
17 | 65920000 |
18 | 197760000 |
19 | 590790656 |
20 | 1772371968 |
21 | 5299916800 |
22 | 15899750400 |
23 | 47578857472 |
24 | 142736572416 |
25 | 427357700096 |
26 | 1282073100288 |
27 | 3840133464064 |
28 | 11520400392192 |
29 | 34517383151616 |
30 | 103552149454848 |
[1,2,6,16,48,136,408,1184,3552,10432,31296,92544, 277632,824448,2473344,7365120,22095360,65920000, 197760000,590790656,1772371968,5299916800, 15899750400,47578857472,142736572416,427357700096, 1282073100288,3840133464064,11520400392192, 34517383151616,103552149454848] |